Other than the fact that Jedi/soldiers get a BAB at first have more HP and better starting feats? Not really.
1. Yes, though creative encounters go a long way towards making this possible. Hazards, unusual conditions and unique settings are your friends.
2.The best motivators I've found in SWSE are vehicles of ever-increasing size and Power. Whether its control of a gang of toughs, being the premier crime boss in a city or running a pirate fleet, Power is the easiest thing to hand out. YMMV, as my SWSE games tend toward the political.
3. Binks has got you covered. All in all, SWSE is the least munchkin-friendly of the 3e family.