1. Just make a 'leader' character that will lead people around, I suggest. Your party needs a leader after all.
2. Just don't take SG for those I guess, BG can do some nice burts, EW can do some nice crits, and Thrower ain't that effective againts Enclave unless you're going for knife crit aimed throws.
3. BG Tank, Leader,
Its just my personal opinion on that.