Not sure on the Healbot, OpenRDX or Vuhdo specifics, but I know all three along with Grid + GridCustomLayouts (which I use), each have the option for a fixed or alphabetical sort.

If the clicks don't correspond, then a repeater region based healing system is actually quite a bit worse then just using macros, as with macros you at least know the heal is going to the injured toon who needs it.

Try a forum search, or if that fails then a google search.
Healbot +Alphabetical Sort