Maybe a mod that would allow us to 'prime' unconscious aliens, and then throw them across the map so that they can explode in a dramatic (but pointless) explosion. Have it do damage based on the throwing soldier's strength and do extra damage to terrain
Oh, or maybe a 'kill' command for the attack dog that does damage to the tile it is standing on.
Ooh, or maybe a mod for a weapon that can be loaded with unconscious or dead aliens and then catapulted across the map.
Oooh, it doesn't even need to be a weapon, it could just be a giant wood chipper, meat grinder, or furnace that one of your soldiers carries on their back and gets loaded. Then they get the option to 'turn the crank'.... which doesn't do anything except make some satisfying noise and get rid of whats inside.
Sorry, I've been playing alot of Piratez, so this is what came to mind.