In HKN you should be able to use MouseIsOverWindowRect to make squares that you can click and then it triggers whatever you sent it to do. So get some addon with some good health bars/raid frames then make MouseIsOverWindowRect squares on top of each character and then tell it to send a key that you put a macro on to heal that player.
You can do mouse healing like that without mouse broadcasting (since mouse broadcasting is unreliable in HKN) to heal from your tank.
It requires a lot of hard coding (both the locations of the raid frames and who gets the heal, which makes it not work when in a raid group/playing with someone else or switching a character. But with just your own team it should work good.
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