Maybe someone should buy a bag of Tuff-nuts and sell them out here. You'd need 5 per bike (four for the axels, one to install/remove them).
For people running Phil Wood hubs, there are a bunch of security screws we can get to fit. Not sure of the thread pitch but I'm sure I can figure that out. Heres a run down on the types of heads (with pictures)
http://www.tamperproof.com/index.cfm...ction=products
The snake eyes wouldn't work unless you want to not beable to wrench down on your axles. The socket or torx pin-head type would work the best. That company doesn't have a socket-cap style bolt but Hudson Fasteners does (
http://www.hudsonfasteners.com/sec/sec_sc_pss_al.htm). They claim they only sell to legit businesses for security reasons.
Maybe a group order for those as well?