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I believe an high percentage of Opera users listen to music from various sources such as youtube, soundcloud, deezer, spotify...etc, and most of the time these users are on another tab, that is the tab with the audio source is not the active one.
As such it could be quite great to have options in the tab that would let users control the medias that are playing, such as pause, next/back.
Like the option to turn off the sound from a tab, each one would appear when hovering the tab.
I think there is a new sidebar extension with every new version of Opera, having the possibility to add any one of them would sure be really great, this could be done by using the mobile version of a website in order to have something that could perfectly fit in the sidebar, this is the method some browsers use, the only problem being that some website on mobile ask you to download their app.
Another one would be to simply fit the website into the sidebar panel, altho this could create a really messy result, both methods have their pro's and cons.
I believe the Opera team have already considered the option to fit anything in the sidebar, and my theory is that they want to avoid any of the previously mentioned problems, as such they make sure to add one thing at a time, with the benefits of having a perfect integration.
Altho i really really want a gmail integration, was really disappointed with the instagram one 
So you say that whenever you press + the zoom function activate ? Does it also happen when pressing - ? Does the "cmd + +" shortcut actually work ? If its not working then you certainly have Num + as shortcut for zooming.
You can try changing the shortcuts one the opera settings, see if the zoom shortcut is set to Num + and remove it if its the case.
Sometimes there are basic math operations that show up on certain webpages, most commonly being shopping websites where the price of a product can display an additional shipping, tax or any other kind of fees, in that case it would be great for the user if the selection pop-up tool could calculate basic selected operations, for example on amazon we could get the following situation :
here the selection pop-up tool would first convert the number on the left side to the user selected currency and would ignore the $22.77, it would be fantastic if the selection pop-up tool could sum $69.99 and $22.77 and show the result in the user selected currency. Therefore the calculator function alongside making basic math operation would also integrate with the functions already present in the search pop-up tool and thus would convert the result of an operation involving a currency, length unit, or time zone.
There is a weird bug causing the search pop-up tool to freeze on the upper left side of the screen. The bug happen when selecting something, however it does not occur the first time the pop-up tool is used.
The bug disappear once i close and reopen the browser.
I'm using OS sierra 10.12.6 with the latest version of opera (66.0.3515.44). Did some of you ever had the same problem ?
@sgunhouse Sorry for the inconvenience, from now on i will make sure to do as you say.
@jojo0587 thanks for your opinion.
"can discuss the addition of a specific site and not throw everything into one bag?" I may be wrong but i think it would be missing an opportunity to not let users add the sites they want to the sidebar, waiting for the addition of a new site is tedious for the users and also for the dev, Vivaldi is currently doing it and it seems to go well.
Some really useful features for Opera in my opinion 
Search Engine in The Start Page
Its not the most useful feature that could be added since you can switch search engines in the address bar (temporarily and permanently) but if there is a Google search bar why not giving the option to change ?
From Google :
To duckduckgo :
Multi Copy
It can always come in handy to be able to select various words/segments of text, such features could be implemented in the pop-up selection tool.
Clicking on Multi Copy make us able to make multis selections, the pop-up selection tool would use all the text selected for the use of search, copy, send to my flow and share
A blue or green line at the right of multi copy could tell when the function is activated or not.
Gmail in The Sidebar
This would be a really sweet feature if done well, saving lot of time like everything that could go in the sidebar.
A website in the sidebar would be like using the toggle device option of the developper toolbox, even if the android app version of Gmail in the opera sidebar look really great in my opinion.
So simulating mobile device websites can make us able to :
Put theoretically Everything in The Sidebar
Adding Deezer, Youtube, Soundcloud, Facebook, Spotify or just anything we want in a mobile experience way, from streaming media to editing a google document. Its a great feature because even if those task can be made in a tab they are still less intrusive and appearance intensive in the sidebar. And such feature could maybe consume less cpu. Try looking at a website mobile mode and look at the result (Developer Menu -> Developer Tools -> 2nd option Top left Corner or cmd + maj + M on mac) , it would be the same but in a toolbar.
Built In Torrent Client
A complex feature, but since every browser have a download manager why not integrating a torrent one ? This would be extremely useful alongside the Vpn client.
Something in the sidebar would look really practical, but it could also be alongside the download button.
Do you like those ideas ?
I don't know if such idea has already been mentioned but i think its a really good one and i'm surprised its not yet implemented.
The Selection Pop Up Tool
Its certainly one of the best features Opera have to offer, this simple yet powerful tool optimize an action drastically (From : Selection -> Right Click -> Copy/Search/Other, to : Selection -> Copy/Search/Other). I think its a miss opportunity to not explore all the options such feature can offer.
A translate function would enhance the user experience by a lot since most of the time translation is done via : Searching on Google, Google Traduction/Others, Extensions and Selection (some extensions can traduce a selection thus creating some kind of conflict with the Opera pop-up feature), which is more time consuming and less practical.
So here are some examples of such feature :
We select the text we want to translate then the translate feature would appear, clicking on it would translate the text to the browser language or any other language that could be selected from the Pop-up search settings. The selected text would be instantaneously replaced by the translated text.
Multiple Languages Translation
Some times we could want to translate a selection to another language instead of the one we selected by default, this could be done by having a drop down menu like the share function in the pop-up selection.
Preferred languages could be added/removed/edited from the pup-up selection tool settings. The order each languages would be displayed on the drop down menu could be selected from the settings or : ordered by the number of times they are used/last language to be used appearing first.
Or we could use a more advanced approach by using a complementary language search tool in the drop down menu of the translate function in order to select to which language we want to translate the selection.
Problems And Solutions
The pop-selection tool bar is already really long (If i recall there was a time where only 3 functions , search, copy and share where on the bar, Sending to my flow certainly appeared after the release of Opera Touch) and can be longer with the unit/currency/time zone conversion, adding other functions could mess up the user experience, but such problem could be easily fixed by selecting the function we want to be on the bar from the pop-up settings, and this is something i really want since i dont really use the share or send to my flow features .