Oh! The drum kit.
Yeah, you can use the GHWT drums to play Taiko. I've done it before, I wrote up a tutorial post SOMEWHERE (no clue where though) and I think I even attached the script. It's not complicated. Like BD said, using joy2key works wonders for this
EDIT: I'm kind of wrong, I didn't use the GHWT drums for taiko, I just used them as an adapter for my Roland TD-3 kit :< BUT! The same thing still applies, joy2key etc