Whether or not you approve of the OP's tone or motives doesn't invalidate his complaint. Role restrictions are supposed to give the helm the ability to lock out certain multicrew options and in this case they don't fully meet that requirement.
Saying "don't use turrets" is no good if you, the helm, want to use turrets.
Saying "don't play multicrew" is no good if you want to let people fly fighters.
Saying "only invite your friends" is no good if you want to meet new people. Or if only one friend joins, in which case the other seat automatically becomes publically available with no way for you to override it.
Saying "I've only ever had an enjoyable multicrew experience" or "multicrew is a pointless waste of time" is offtopic.
It's perfectly reasonable for players to join multicrew, see that there's a gunner role with turrets and assume that they're up for grabs. Therefore it's perfectly reasonable for the helm to grow tired of typing "sorry I'd prefer if you only operated the fighters" over and over again.
It's possible to lock the fighter con. It should be possible to lock the gunner position too.
Saying "don't use turrets" is no good if you, the helm, want to use turrets.
Saying "don't play multicrew" is no good if you want to let people fly fighters.
Saying "only invite your friends" is no good if you want to meet new people. Or if only one friend joins, in which case the other seat automatically becomes publically available with no way for you to override it.
Saying "I've only ever had an enjoyable multicrew experience" or "multicrew is a pointless waste of time" is offtopic.
It's perfectly reasonable for players to join multicrew, see that there's a gunner role with turrets and assume that they're up for grabs. Therefore it's perfectly reasonable for the helm to grow tired of typing "sorry I'd prefer if you only operated the fighters" over and over again.
It's possible to lock the fighter con. It should be possible to lock the gunner position too.