This post is very old but I don't feel like making a new one.
Please make this a feature! I use a mac and some of them are redundant. Reload has a keyboard shortcut, Speed dial appears when I open new tab, Flow can repeat in sidebar and toolbar, Mac has its own screenshot shortcut, and most computer will have have their own battery icons.
I really like the buttons, but I'd like to see the URLs bar even when I resize opera to very slim window (to show multiple apps on my monitor). Since we have sidebars as well, there's no reason the buttons have to be on both bars/ has to stay permanently on the toolbar. Having the option to customise the toolbar will be great. I'm reluctant to change from Opera, it's the best browser for me.