well my entire fleet bank was just looted by a player i am forbidden to name. I think one simple solution to this would be to add an option that locked players out of bank after a preset number of withdrawls. I could then set it so that someone could only withdraw, say, 3 items a day. if they needed more someone @ a higher rank or another fleet member could help them to get it.
For now all i've done is submit a player behavior complaint to a GM, if someone knows something else i can do, please let me know.
EDIT: I'd like to point out that people looting fleet banks are in direct violation of crypric's policy against "Intent to scam another player "