[Suicide Junkie]

RE: Psychic Takeover weapons. The damage amount is equal to the % chance that the ship will be taken over.
Fighter weapons stack, so if the fighter's AS only does 1 damage, an stack of 100 fighters will be guaranteed to take over the target ship.

Re: shield regen. The abilities are treated completely separately, so the regen will happen every turn.
As another alternative, you could have the weapon use up negative supplies. Your ship would then gain fuel every time you fire, even if you miss.

RE: repair. To make automatic repair, add the ability to the vehicle. If you want to require crew in order to do repairs, either add the repair ability to a new lifesupport component, or create a "Damage control teams" component, say 30KT : 1 repair(lowtech) and 15KT : 1 repair (hightech).