Alternative missiles:
Single-shot weapons mounted on an engine and given to a missile launcher. Firing controlled from the ship of course.
Put any normal beam weapon, set a firing range, missile flies over, delivers one shot and runs out of power.
Might also give an option to mount two shots or more by doubling size, essentially mounting two weapons instead of one.
Obviously warhead is replaced by weapon + capacitor. (using the associated beam tech)
So we can have meson missiles, HPM missiles, sort-of-laser warheads, etc.
Leads very nicely into drone ships. If the capacitor size gives X power from which the weapon draws to fire, giving multiple shots, then bigger missiles can stick around to shoot a few more times. Drones are obviously the one for that, with buoys having an interesting new minefield type.
Drones could then become short range, one-way trip expendable mini-fighters. Fighter-like action for empires that dislike risking crew. XD