My application shall always have a username, and I would like to identify users by it. So I would like to set the username as the _id in MongoDB, without the need of copying it. Is it possible to set the _id on registration to the username and omit the additional username field?
useraccounts:core and already managed to add the username to the signup screen. But I did not find a way to tell AccountsTemplate to use the username as the _id.