The blackscreen issue is caused by having the avi versions of the cutscene rather than the superior MVE ones. When ShivanSPS compiled his package the avi versions were all that would play. This has now been fixed so if someone has a link to the MVE versions I'd suggest getting that.
In the meantime the problem you're getting is due to having DivX Toolbar active. You can turn this off from your startmenu if I remember correctly but according to Taylor (The coder responsible for the movie code) the very latest version of FS2_Open should fix that problem as well. You can get it
here. Again simply replace your current build with this one.
The manual can be obtained from the
Home of the Underdogs FS2 page. (I could have sworn I had it available via my FAQ but if it is, I buried it so deep I can't find it now
)
As for needing a joystick there you enter the kind of question that causes multi-page discussions.
The game is playable using mouse, keyboard or joystick. Which works best generally ends up in a long discussion