Thanks for the answers so far.

1) Disabling is fine. I'd like to know if it's possible to turn the power off on the cellular radio. If I'm not using it, no need to have it on at all. I'd guess that would have some impact on battery life.

5) In the case of fbreader, in fullscreen there is no title bar to click on (at least there had better not be, screen real estate is already at a premium). I assume that there will be a keyboard combo? I hope we wouldn't have to go to a windowed mode to access a menu, then back to fullscreen?