Each madness feat is basically equal to 2 regular feats, balanced out by the Wisdom check penalty.
I was a little unsure about Insane Confidence. As it is, most PCs with a hefty madness score will pick it up regardless of their Charisma, just to escape the Will penalty.
However, if I leave the...
Edit 11-11-09: I've updated this following feedback I've gotten over at Giant in the Playground.
I'm trying to create series of "madness feats", which work independently from Unearthed Arcana's Sanity system. These probably wouldn't work well with the Taint system either. How do they look...