For the curve and bold q and p should work as FF and RW keys. (It also allows for # and @ in case alt-lock is on). The . and ! are there for pearl users (their top left and top right alt keys). Basically, on whichever phone you have, the top right and top left keys on the keyboard should always do a fast forward or rewind with one press, regardless of the state of alt or shift.
The trackball thing might be.. difficult. I'm not entirely opposed to it, but it's probably not going to happen any time soon. What I may do is have the 5 second skip (since it's fairly useless going forward) be the 30 second skip, and replace the 30 second skip with something that skips x% of whatever is playing. That may be a short term fix until I do something more useful (like trackwheel selection, though even that would be prone to issues).
The 30 second thing is useful for podcasts, but now that it supports playing any file on the device (like audiobooks), I think it needs to be a bit smarter about it.
For more/quicker help make sure to check out the user manuals