I think I could not quite understand your question...
It is too specific for this site and certainly not any kind of critical issue but I wanted to give it a try.
But if you want to change Mouse gestures, i think it's can't be possible
Not really related. They all require dragging and gestures, not really useful to me.
There's also "click" and "dblclick". There's also "wheel". There ar...
A "click" is what I had already mentioned, as also described in the link you sent to me.
"The click event MAY be preceded by the mousedown and mouseup events on the same element"
And a "dblclick" is a thing apart as also stated in that same page.
"The click event MAY also be followed by the dblclick event."
So I'm not talking about that. And the "wheel" isn't really related. There are indeed a bunch of events assigned to different things, but the buttons themselves work nearly the same, and I am specifically talking about what constitutes a "click", either it be on any browser or Windows, functionalities are all scattered between requiring either a full button press followed by a "mouseup" (going back to its original position) or just a full button press.
You can test whatever button you want here, they are all the same, but I am as I said talking about the "click", and only that specifically, either it be a left or right (for the left-handed) mouse button, or rebinded to whatever button, middle, side, etc... It doesn't matter.
I've been looking for a way to universally trigger at least some elements or all of them already on "mousedown" but I am not sure if such a thing exists, if it is purely bound to HTML then I am not even sure if it is worth thinking about it, maybe I could get it to do what I want with some kind of extension or a third party program, but I wasn't able to find anything, the closest thing I can think of is "Autohotkey" but then it wouldn't distinguish between elements, and I haven't actually tried it yet so I'm not sure how well it works.
And no, Opera behaves just like any other browser, and it isn't lacking anything to me.