I've been really wanting more Quick Controls, so this is fantastic so far!
I do have a few thoughts; hopefully you'll find some of them worth doing:
1) Could you provide an option to use the volume rocker for other uses like page scrolling or tab switching?
2) A very minor point that drives me crazy is that if I select the menu option from the quick controls, the pop-up menu list always pops up on the left side of the screen -- it'd be nice if, when I use the quick controls on the right, the pop-up menu list (i.e. the option I get when pressing your "!" button) would pop up on the right so I could easily reach it with the same finger/thumb I used to activate quick controls.
3) I'd love a quick way to access notifications when full-screen browsing -- perhaps something in quick controls or the pop-up menu to pull down the notification shade -- or maybe even better, an option to launch an application from quick controls or the pop-up menu (since I could then use something like status bar expander to pull down the shade).
4) Some sort of quicker toggle for inverted screen -- I like the black background for battery savings on AMOLED screens, but it's annoying how it also inverts pictures. So, if I want to quickly see a picture displayed properly or if a page just doesn't seem to be displaying properly when inverted, it'd be nice to have a quick toggle to take me back to the normal state instead of having dive down into accessibility options.
5) I suspect this might be difficult -- but I'd like to have the option to customize the tab that gets focus after closing another tab (like in Tab Mix Plus for Firefox). Right now, I'll sometimes open 5-6 tabs in the background from a single page. I'll go to one of the pages, read it, then close tab and end up back at the original page. Then I'll have to switch tabs back to one of the other background-opened tabs and repeat the process -- taking up extra time, even if I use the tab switcher instead of using the X or back button on the quick controls. Instead it would be nice if after closing a new tab, I go directly to another of the new tabs, until all the new tabs have been closed and I'm back to the page from which I opened all the new tabs. I guess a tricky part is keeping another desirable behavior -- when opening a link from Gmail for instance, closing the linked page should still bring you back to Gmail.
6) This is probably something that requires root and even then I'm not even sure if it's possible -- but it would be super-cool if you could add extra browser buttons to the soft menu area on the Galaxy Nexus -- an option to put a frequently-used button like a refresh button or bookmark button or whatever.
