Good idea?

Depends on how it's implemented. It'd be tough to get range and such.. and there's so many variables..

unit number
unit hp
unit x position
unit y position

(for each unit though you could use an algorithm that places these into a variable var#, like "7 -> var#(UnitNumber*3)" though a bit more complicated..

Also, you'd have to be able to select the units you need, probably moving your hero(maybe a just a square animation) under the unit you desire, hitting space, changing the unit to blank, changing the hero to the unit's animation, then moving the hero a set number of places, and automatically resetting your hero back to the square and the unit back to its animation. (Whew)

All in all, it'd be very difficult...