Please enable Rollbacker, Autopatroller, Flood flag, and Flagged Revisions extension on Bengali Wikipedia (http://bn.wikipedia.org). Make sure all flags can be granted and removed by local administrators to the non-admin users. Also administrators should have the technical ability to grant flood flag to other users as well. Please take a look at http://bit.ly/fm6dXu for local community discussion and consensus. Thanks in advance.