personally, I liked the name "Taint of Shame" better for the class feature about retraining Paladin levels, but that's a thematic thing. but whatever.
I gotta speak up about Ciaran's comments, though. in my games, I tend to enforce heavy roleplay in my games (usually with awarding small amounts of EXP for good roleplaying; penalizing EXP for metagaming, disrupting the game, or breaking character too much; and awarding an Action Point for doing something dramatic). so I didn't even consider the possibilities for abusing the non-mechanical taboos. I frankly like them as they are. however, I suppose that he brings up a valid concern. I would suggest coming up with a phrasing that makes them more clear, or else make a more mechanical condition for those taboos and mention that as an optional rule with DM/GM permission you could use the less mechanical taboo conditions. fr myself, I'll likely continue to just use them as they currently are, though.
and similarly, I tend to use Weapon Groups rather than the Simple/Martial/Exotic categories. but he's right, that in the core rules that's not the way it works. Weapon Groups is a variant that can be adopted as a house rule. I seem to have a bad habit of not noticing issues with rules I don't use. XD oops.