Use email like username

Today we have so many username around the different platform that the best things is to use email address like unique id.
Time ago this was allowed to login to imscp panel but now it isn't.
Is possible to restore this feature (if not for all, at least for the panel).
Thank you

omg maybe I mixed the old ispcp or maybe bypassed the control on username sorry in any case

Confirm I changed it directly in the database also for security reason (avoid standard name "admin" to be used).