I'm all for this too, I've made a macro for easy-targeting my Aero like :
/ac Aero <t>
/ac Aero <tt>
This way, i can target tank for healing and quick throw an Aero on his target and still cast aero on the target I want when solo playing.

But due to the "non-queue-able" thing of macro , i revert to the full manual targeting... :/

PS : Also, give a way to remove the ever annoying red message and "bip" you hear for the "cannot use this ability on this target" thing.
I want something like this :
/ac Aero <t> <noerror>
/ac Aero <tt> <noerror>

or at least this (or both, like wait):
/noerror on
/ac Aero <t>
/ac Aero <tt>
/noerror off