This is would be a very useful feature. If we could change the target priorities depending on the missiles loaded as well, this would be perfect. The spidertron's 'grid square removal' approach to targeting leads to a lot of waste of ammunition and inadvertent kills.

There is a 'Watch your Step' achievement for dying to a train. How about a 'Rods from God' achievement for those killed by drops from orbit?

https://en.wikipedia.org/wiki/Kinetic_bombardment