Sometimes matchmaking does a decent enough job only for ship swaps to completely kneecap its efforts. Would it be possible to allow ship swapping in a game if the matchmaking system thinks it will make the game more even? Another option would be an 'optimize lobby' request which reshuffles the ships to make it as competitive as possible according to the matchmaking system (say requiring an okay from all captains for it to happen). By allowing it only when matchmaking says the match will be improve you prevent the abuse of the feature that likely resulted in its removal.
Why I would like this feature
The other day matchmaking dropped me with a nice, communicative but relatively novice captain (~100 games) facing off against an experienced captain (>1000 games) and another nice, but novice captain. Crews were generally comparable to their captains in terms of experience. We lost 5-4 but it was fun and the other experienced captain seem to like their ally. Teams co-ordinated, every ship got killed at least once, it was a tense even game. Gold star for the matchmaking system.
The next game saw myself and the other experienced captain facing off against the two novices due to ship swaps. The result was entirely predictable (a great novice captain will still usually get beaten by a bad experienced captain), even though we crippled our ships with ineffective builds it was never going to be fair and it wasn't really fun. The inexperienced captains lost most of their crews during / after the match and it wasn't a good game for anyone. Both myself and my ally for this match would have gladly offered to swap slots to make the game more even but couldn't because this option no longer exists.