As killer robots are nominally no different than land mines I could see support for banning them. My understanding however is that land mine use (or area denial weapons), are still allowed if there is a way to definitively disable them at the end of hostilities. If my understanding is correct, and robot weapon designers are able to successfully counter with the notion "but we can turn them off after we're done." then this effort won't go as far.

At a conference over the weekend in one of the couch discussions there was a suggestion of a 'nearness' limit, sort of you can't use deadly force unless you are within a 10 mile radius of that use. The goal being to outlaw more developed countries flying drones over less developed countries and picking off their citizens.