When you are in the fullscreen app that doesn't show the bottom bar you can just press the screen place where the button is harder and not swipe up/down/left/right and then tap the home button.
I was wondering if that would be difficult to add the ad-hoc WiFi support (I mean to let Nexus connect to ad-hoc networks rather than create ones)?
That's, as for me, one of the most irritating lacks of Android.