Seek target and ram

Does anyone know if there is a way to set the behaviour of a vehicle to automatically ram anything that is designated as a target in combat?

This is what I have tried so far.

In VehicleUnitTypes, creating a type that has the capability "seeks towards target and rams" - this capability immediately removes the ability to target other things. You cannot influence what it chooses as its target.

In combat assigning the "ram" command does it nicely, but I would like the unit to automatically choose to ram when a target is selected (ie not have to select "ram")and retain the ability to change the target.