1) You can't do this because there is no wheel or buttons for that.

Don't think so it's very needy to answer other questions because project was frozen in August, 2009. So fernLighting won't support Cube anymore :/

1. Dunno.

2. /fullbright 1

3. Yes, just put a sky texture on the roof.

Cube for iOS is/was just a demo; wasn't meant to really be played or edited on.

The Cube game for ipod doesnt have the real charme of the original game, because it has
-sucking handling
-pretty much running problems
-and nearly no map editor

My tip : Try the original and delete the ipod version ^^

my suggestion for this problem:
try first to understand the original version, just on a real computer. understand at least how the settings of cube engine works and then go try out wacky things like that...