A new collision mask; would allow Beams to interact with enemy Ship objects but not commit friendly-fire.
They're the only weapon in the game that cannot be entirely prevented from committing FF without breaking mechanics atm; a mask of SHIP masks enemies with shields up, but does not mask them if shields are down, but only if they do not have a Shield at all (i.e., if this is set, ships with Phase Cloak can never be hit), which is weird.
Anyhow, not the world's biggest problem, just a minor annoyance, since I'd really rather just get rid of FF altogether and now I guess I'll have to do an auto-fire check just for Beams.