Smartheal uses the unit frame clicks to cast healing spells. Luna hijacks these unit frame clicks. Can you make an option to completely disable the luna click cast system so smartheal and other unit frame-clicking addons are able to function.

http://forum.nostalrius.org/viewtopic.php?f=63&t=5276&p=157037&hilit=SmartHeal#p157037

Also why even use unitframes if you have an addon that plays the game for you?