QUICK HEAL: The heal is tied to a single key press.
This is what the magic quick heal does by clicking on the player,it skips all the intermediate steps and makes them automatic.
POTION QUICK HEAL:
The player normally has to open a window, select a potion, and use it. The act of looking away to find the correct potion in the window is what usually gets me killed, as I was needing a heal at the time already. A quick heal uses a pre-selected potion.
There may be a way to do it with some of the other "Quick" features, but I have not figured it out yet.
This is something useful to everyone, and should not require being a programmer and reading the manual to setup.