WELCOME ABOARD!
1) If the officer has a qualification for that station it makes a huge difference in the efficiency of the compartment.
2) The more green is showing, the better the compartment runs. Having the bar be all green means that efficiency is at its maximum.
3) Only SH3 Commander can do that, and it isn't a mod, it's an external program that works with any supermod or stock SH3.
http://www.subsim.com/radioroom/down...o=file&id=2923
GWX does need a special file to work properly with SH3C, available from Jimbuna's signature link.