What kind of wood for interior wall?
One problem with using PT in that manner is the twisting and bowing of the PT as it dries out. Ask me how I know! Methinks that a better method is to use standard studs with a proper vapor barrier to prevent water or moisture from getting to the wood. For bottom plates, though, I believe PT to be an excellent idea.
Too, with the newer PT formulations, one has to be careful to use the proper fasteners...I think it requires HOT dip galvanizing or stainless steel.