Healing with interact to target

[Cynical23]

This is what I have done to see if it worked, and it doesn't using keymaps.

First I created a action target group only for melees, I left my priest excluded. I created a keymap to press IWT, and go just to the action target group melee.

However it does not work still. I spam the keymap, and my priest still has delayed healing or doesn't heal at all.

*EDIT** Just for clarification it isn't just healing, its for any spell on the priest.