Prevent a reseller to change his reseller username without having to disable the Super Privs >> Account Modification option
Client management software like WHMCS relies on account usernames to suspend and unsuspend accounts, hence for reseller, the reseller username is no longer a reliable index, as the reseller can change that himself, making him invisible for the client management software. A possible, but undesirable solution is to disable the account modification privileges for the resellers, but that will increase support for operations they should be able to do themselves.
If you have a few accounts this is not a big problem, but managing thousands of clients on hundreds of servers makes this option mandatory. It would be nice if there is an option inside WHM, where when checked, removes the username filed from the Modify an Account menu, when a reseller cPanel account is being modified.