I've been musing about simple security tricks, and was thinking about
those hex skewers that you can replace your QR ones with.
It would be smart if you could get them "keyed", or in different
patterns of fastener, then you get an adapter that goes on your hex
key. This is no different than what VW and other car makers do with
wheel lug nuts.
Another option would be to go to a more obscure fastener like torx to
slow down the thieves.
Any other ideas for lockable wheels, short of using a cable or a u-lock?