There's already a rule that shooting bank entrance is not allowed, you can report the player for that reason.
I'm opposing the suggestion because adding command to go in bank will be too much of a serious mess and then again we add timer for it too, to prevent evades so the players will get disturbed with it. It will definitely harm player count and player's interest.
Just report the player ingame if there is no admin in server or on IRC, gather evidence and report on forums, you should do some hard work.