No, munchkinism is a chunk of what Mongoose publishes, or at least I think so, my players are minmaxers to the extreme and love Mongoose publishing I've tolerated it thus far... I'd say if people want a good example of regional feats they should take a look at the Forgotten Realms campaign setting book for examples, I think Kingdoms of Kalamar has some good ones too, and seeing as they're regional feats further restricted outside the standard prerequisites they should give some sort of edge over the standard feats, however only a slight edge. My personal opinion is that +3/+3 isn't too powerful, it gives a nice advantage in the earlier levels though like many feats balances out by the higher levels, not at all close to munchkinism. Though I must admit I am biased and have issues with WoTC and their ideas of game balancing so perhaps +2/+2 isn't so bad.
At the risk of making things more complicated I've always liked the idea of customising, making characters a tad more unique in a sense, making small options like an additional 4 skill points to divide between Swim and Balance checks so a character who preferrs blance to swim might pump +3 to that and +1 to balance. It's not much of a difference but it's nice to have options. BTW on the off topic note of customization, anyone know if D20 GURPS is any good? Worth buying at all?