[LeTharg]

1. I asked once about sweep mines and was told that it was useful for tactical combat to handle mines released during combat. Since I only play PBEM, I can't verify.

2. Trading comm channels is very useful in PBEM games. One way is to agree on the trade and then each side gift the other. Since you can see the other players on the load game screen, it would make sense to me to have a list of all comm channels for trading purposes. I would also like a game option to have all comm channels available to everyone (sort of like seeing all scores).