Now there appears to be no easy solution to delete Banned members at once from the forum. Lets say the banned members keep accumulating over time. The Banned Members link in the ACP only allows to lift ban from the users. Deleting would require searching users with banned status and then deleting them one by one. There also appears to be a small bug here. When you delete a banned member by click X found through the search function, after deleting, it goes back to the Users main menu. So we have to perform the search again for banned members.