I would definitely like to see something like this. Tonight I finally got off my bum and rebuilt my Whm macros (with priority of <mo>, <t>, <f>, <me>). It's a great set for healing mouseover first, target second (for, say, healing pots in CT - hard to mouseover with people/mobs everywhere), focus third (tank?), and then yourself last of all (as the default spell would).

The PROBLEM with this led me to pretty much wipe my party. IF you are not in range (which happens ALOT in CT where I was practicing the new macros) of whomever you are trying to heal, it will commence healing the next priority - almost always yourself. So what happens is your character begins to cast, so you think it's working. 2.5 seconds later - you heal yourself, and realize your tank is still dying. If we had something letting us know that the target was out of range, we wouldn't waste such time. For now, with this issue, all macros have been relegated to <mo> only.