Yes, aircraft were used for minesweeping purposes, so you're asking for magnetic mines, not the standard contact mines (that were used far more extensively). Contact mines require manual sweeping, and that means deploying paravanes (which would have to be developed and coded) and a specialty class of ship to do it. Yes, all warships carried mine-sweeping paravanes during WW2, but they were hardly, if ever, used on capital in times of combat. Once the mines are swept, they were destroyed by gunfire, either using rifles or light AA guns.
We can barely get players that are capable of turning a CV when bombs start falling, do you honestly think that players are going to take the time to mine sweep an area before leaving a home port or sailing into a bay to shell a base/town?
You also have the time factor...Let's say you log in at 7am and lay 50 mines off shore from my port. You leave, and no one else knows that those mines are sitting there. Do we place the responsibility on our fellow players to check and sweep for mines before we kill our own CV, who gets credit if you are lucky enough to sink a ship? It could take hours, even days, for a ship to run into a mine. If you're not logged in, will you get credit for it?
Mining played a key role in the destruction of shipping during the war, I won't deny that. But in the game, I don't see a managable way of implementing it. Same holds true for anti-tank mines. The way the battles occur in AH, people jump from one base to another as both offensive and defensive players. There's no orderly defense of bases, no resources that you can implement to assist with the defense of the base aside from throwing out vehicle supplies and camping spawn points prior to a perceived attack.
Mines don't discriminate - they'll kill a friendly tank as quickly as an enemy. So you lay mines, and 45 minutes later, a fellow player drives his task group through your minefield. Making minefields visible to each country on the clipboard maps gives it away completely as long as players have ghost accounts or country-hop within a game.
As for Catalinas carrying troops...aside from landing on the water offshore and waiting outside the dar for the base take (which we can accomplish with a goon and 10 troops simply by loitering), what purpose would a PBY serve in the transport role that we can't already accomplish with existing aircraft?
I don't mean to be a jerk, but I'm sure these are the types of questions the AH programmers and developers ask themselves every time they consider a new feature to the game, so it only makes sense for us to consider these same questions before we ask for things.
J