I'm not a fan of this. Mostly, I dislike the fact that the bonuses already discourage role-playing by encouraging min-maxing. If these bonuses are made even more important, then I fear it's going to create a situation where people are (for example) making a decision from the start to always choose pragmatic over romantic because they absolutely must have the +2 crafting bonus. Let's face it.. +2 to a bonus can get you to a score of 5 and save you 9 ability points per trait. That's ridiculously huge.
Not for all bonuses, certainly. I agree that getting +1 Ability per point of difference in a Trait would be far too much. I also think getting outright immunity to being cursed from just one point is also too much. I think Traits could use some tweaking, but I'm not too sure exactly what.
Generally though, I do think that going 5-0 from Trait choices should be more meaningful than going 3-2.
