1. Me too, I click on the editor, and then the shortcut works.
2. By default, no. You can go to "Settings->Editor->Keyboard shorcuts" and set the short key you want.
3. Simple select the lines you want to indent/unindent and press Tab (increase) or Shift+Tab.
4. Mm.... Can this be a bug? Are you using stable 8.02 or a nightly. If you are using 8.02 you should try the latest nightly, because this can be one of the fixed bugs since 8.02.
5. As for rebuilding code the debugger must be stopped, you should stop debugging before modifying code. In any case, C::B shouln't be frozen in that case. I'm on Ubuntu 8.04.1 with the latest nightly and I didn't experience this problem.