Mythryndel, it is true that such a mechanism is double-edged, like the /challenge tool is. It protects RP in some ways, while it forbids other forms or RP.
I could happily play a case like the one you describe: being healed, then assault verbally the healer, then receive a lecture, or an apology, or a butt-kicking session, or whatever. But indeed you had a reason to heal IC and you did wait for the dialog to occur with that guy. You were in a case where the permission thingy would be more than bizarre.
Unfortunately, most healing happens with no reason, as when walking through Hydlaa plaza, in the Arena, which is the opposite of a hospital, by a merchant while browsing through his wares, or while you're chatting with the NPC best healer of the world. Not to mention that in many cases, you're not even physically injured: Dakkru curse just ended, or you equipped a magical blade raising your stats, or you're quietly sit trying to combine glyphs.... Anyway, all these examples have in common that:
- You are not in danger
- You are not asking for help, although you have all the time you'd need to do so
I'd be happy if players refrained themselves, or if they would just talk before acting, as in "are you injured?". Never mind the trollers (or whatever you call them); there are so many possible ways of annoying someone, this is not the worst one. But if game mechanics are to be added, let's think of a better, less RP intrusive way. Maybe a Resist Healing skill? Healing as a contact spell instead of ranged? Healing only possible inside a group? Healing zones?
I'll keep thinking about it. Meanwhile, I created a healer character, to study things from the other side. In particular, how does a healer fit in a world where people don't die?