Seeing that Supcom preview reminded me of this very old lacking stuff in oTA and Spring.
Comand unit to move to destination x but attack until destruction any targeteable enemies that come to range.
TA and spring get away with it because almost all units fire while moving and have a firing turret independent of the movement body. But it still causes great grief (never had you artilery, jethros and merls walk into the laser towers of the oponent because you ordered the entire army to #move# into the base of the enemy?)
This is actually a very basic feature of most RTSs. Hopefully, we will see it in Spring sometime in the future.