QUOTE (Cain @ May 9 2009, 02:35 AM)

Actually, no it doesn't. Your character could have studied karate, Muay Thai, boxing, wrestling, or any one of a hundred different styles. They don't need to master all techniques in order to have a high Unarmed Combat skill. The skill is just an average of their ability across all areas, not an exact level of proficiency in particular techniques.
For example, let's assume we have a RL boxer. He's a very good boxer, but not so good at the ground game or kicks. This averages him out to an Unarmed Combat skill of, say, 3. We then compare him to the jiujutsu stylist, who doesn't have much in the way of striking power. Because of that, he gets averaged to a 3.
In the first two cases, the fighters have great skill in their chosen areas. But because of the way the rules work, their skills get averaged to a much lower level. It's possible for the boxer, if he was good enough at boxing, to have a higher average skill-- he's mastered boxing to such a degree, his unarmed combat skill instead averages out to a 5. He's still weak against grapples, but his pure striking skill makes up for it.
Expanding on what Cain said, the mechanics already help make the gap between specialized areas of fighting even more noticeable and truer to life, because those quality bonuses help out too. That boxer can hit harder with bonus DV and block better with bonus dice. That bjj practitioner can takedown better with an extra die, subdue better with extra dice, and subdue more effectively for more damage (bonus DV)
When you look at dice pools, the boxer of skill 3 (boxing +2 spec) with those four quality bonuses, is rolling 7 dice to block, 5 dice to punch and potentially punching for a +2 DV more. The BJJ fighter at the same skill (3 (BJJ +2 spec)) with his bonuses is rolling 6 to take down, 7 to subdue, and doing extra +1DV when he does submission damage.
But, if you look at their respective pools to try and accomplish what the other does, we see the boxer sucks at take downs (3 dice vs. BJJ's 6), sucks at subdual (3 vs. 7) and when doing a submission damage move doesn't get his +2DV like he would when punching. On the flip side, the BJJ fighter isn't as good at blocking (5 dice vs. 7) and won't strike as hard.
I'd say the rules don't need anymore tweaking.