I'm really on the fence about the whole ammo things.
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I think it would be silly to be able to use something that reloads ammo (multicannon bullets) to reload shield cell banks (big batteries).
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I also think that ammunition limits should be exactly that: limits.
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However I think there are too many advantages to laser weapons, enough so that some ammunition based weapons are too situational to be relevant to most players, and are dropped in favor of the multi purpose ones. I think bringing more ammo to the fight (or being able to give someone else some) would help even this out.
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At any rate, if this were implemented, when the subsystem is destroyed, it should detonate, dealing huge damage to the ship.
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this would give larger ships a major advantage in combat as they would effectively have a never ending supply of ammo.
This isn't a bad thing. They're large, expensive ships. You get what you pay for.
that they don't need to rearm as often, I have an anaconda that fights with 36 shield cells on-board (7 banks of the suckers) plus 3 lots of chaff (33 in total) and provided i switch between them in time can stay in a CZ for upward of an hour, if i could reload on the fly i'd never have to leave and would be effectively invincible.
This isn't a bad thing. You're the most expensive and heavily armed ship that can be owned by players. If you fit purely for combat, you should be a seriously unstoppable force to be reckoned with. You do bring a billion credits to the field, though I'm sure three or four fixed vultures would still tear you apart.