Here's a treatise on converting front lights to rears, as well as a few other things. I plan on doing it soon. The thing to remember, is that it gives you yellow running lights, and they are illegal in most, if not all, states. Here in Indiana, they don't stop people for running stop signs and lights, speeding, seriously speeding, excessive noise, etc, etc, so I figure I'll chance it. The solution is to put a switch in line with the running lights, so that you can turn them off, so they LEO doesn't decide you can't drive the bike like that, and try to impound it.
http://www.rattlebars.com/mtz/signals.htmlThe other thing I am interested in is making a circuit board, that lights bright red LED's, like the Electrical Connection ones. I make all my own circuit boards, so it wouldn't be tough, just haven't found time to do it. Someone was going to send me a set, to play with, but didn't happen...
Good luck. I DEFINITELY want rear running lights!