How about just kicking enemy factions players out of the ship and making them temp KOS with it as soon as they hit a player of the ships faction (who is not hated)?

This would be similar to how the ctc transports work. Hit them and they don't like you anymore.

why not simply make the cap ships fire not be able to harm it's own national defenders, regardless of who's sitting in the gunners chair. So… The Sola can not fire on Itani, unless they are under -600 faction, and same goes for the Protaris for serco and Zelor for UIT.