It would be nice to have an alternative firing mode for the plasma weapons, which uses up maybe half the clip but then fires a plasma bolt which generates an explosion/fire. This would give the aliens more versatility and allowing them to have a "fire" weapon in their repertoire.
For the Trekkies, also lasers could have a second mode, which generates a small amount of stun damage:
"Set lasers to stun! We need this one alive!"