I'm pretty sure I saw these being done before somewhere, possibly in the trials world? Seem familiar. Not entirely sure how well they'd work, but we'll see. Just seems that it might end up being like when you've got a bent axle and you try tightening it up and your wheel moves a bit (EDIT: Seems like Russ has some similar concerns, the issue about more tightening = more chain tension was something I'd thought about too). Either way, ta-daaaa:
More pics 'n' un-questioning general marketing blurb over on Ride US.