I’ve just added a section to the Systems wiki page, tentatively called Position Combat. This is entirely personal preference based and not really tied to Dark Sun at all, but the goal is to be able to more readily run combat scenes on the fly without needing a scaled map, while still allowing everyone to have the kinds of tactical choices during a fight that you usually associate with map-based game systems.
Full confession: I sketched out the first bits of this system before someone pointed me in the direction of 13th Age, which is turned out to be really similar to what I was working on. If I’d have read that first, I might have
stolen adapted more of it, but the way it is, I’m probably going to give straight 13th Age a try anyway.