Phys resist conversion would be soooooo broken, unless it was so small it was meaningless. Resistance is one of the few totally cheap things in the game and is/can be totally OP. Still, I like the races as they are, and higher levels would require a slew of new artwork.
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.
Download over at ddmod.weebly.com!