Thanks for your comments. We always welcome feedback.
We support both of your requested features already, as far as I know, though ldap/mysql is not currently supported for user accounts. Jamie is working on LDAP support, however, and it is likely to be an available user database option within a couple of weeks.
If you’re having trouble making use of either feature, let me know and I’ll see if I can provide some guidance. A lot of new stuff has gone into Virtualmin Professional and the documentation hasn’t quite caught up with everything it can do.