Can we have an option for moves like (Earthly Star, Sacred Soil, Salted Earth) to show the targeting ring only if we have no target?

Basically, on controller I have this macro
Code:
/micon  Earthly Star
/mlock
/merror off
/ac Earthly Star <t>
/ac Earthly Star
What it does is use the move centered on the thing I target (usually the tank) or allow me to place it wherever I want if I untarget before using it.

This macro is extremely convenient for controller users