If you really want to click...

You could disable the FTL.
And go with say a Focus Leader approach.
And have things like:

#show
/cast [target=FocusTarget] Spell

That way, when you click and the click is broadcast, they all click on the macro which casts at the target of the focus.
I personally greatly prefer the built in FTL, but this is a working click method in the interim.