Funny, my group just played Star Wars Saga edition the other night, and a similar charge issue came up. The concern was that you could disengage from melee and then charge the enemy you were just fighting. The next day the GM asked the group by e-mail whether he should house-rule it. Here was my input:
Quick thoughts on Charge: I think it works fine as is. The GM is absolutely right to point out the AoO provoked by the abusive example. Plus, I can think of a few cinematic ways the rule might work out. For example, take a Jedi with trained acrobatics skill and quick draw feat. Now assume an enemy gets the drop on her, and she's right next to the enemy. She can tumble away from an adjacent opponent without drawing the AoO if she rolls acrobatics check against a DC 15, draw and fire up her lightsaber before she hits the ground a few spaces away, and then charge back into the fray. In cinematic terms I'd probably describe it like this: E'anna Syne's lithe form arced away from the Devaronian bounty hunter, performing a backflip and tumbling several meters away. As she rolled, her lightsaber appeared in her hand as if plucked from the ether. She ended her move in a crouch and her lightsaber blazed to life. Before her attacker's jaw had time to drop, E'anna charged, her saber striking the horned foe down.
In football terms, how many times have we seen a striker (fast defensive end or outside linebacker) speed rush around the edge of the brute defender (offensive tackle) and blindside the squishy leader (quarterback)? Except in football, that's when the whistle blows. In D&D, no whistle to stop the action ... and now the big, very angry defender is behind you. Payback.