Hey bro....yea you can't wire something like that straight-away...there's some necessary code you've gotta throw in too.
I've gotten twisty bones working 98%* properly on my boy rig for my film....when I get home I'll post up the code
*I say 98%, because at certain extreme angles the twisty bones don't do a full twist, only a partial twist...so once in a while you've gotta manually tweak them a bit.