1. Depends on the boat. S-class is about 6 kts, Later classes about 8-10 kts.
2. 48 hrs within 50 nm of the star that marks your objective. I wouldn't quite "move out independently" as people have had trouble in the past with getting retired early because they didn't follow orders. Radio a status report once you've completed your objective and you'll recieve a new one. Once you're low on fuel or torp's, don't radio in, finish what you're working on a head to the barn.
3.
http://www.subsim.com/radioroom/show...t=adding+music
4. Can't answer
5.
http://www.subsim.com/radioroom/showthread.php?t=118923
6. Trigger Maru is currently supported while I'm not sure if Beery has discontinued support for RFB or what, but that one's for hardcore realism only. TM is a great mod and seems to be most popular.