At the moment I'm using both LDAP and MySQL with Guacamole. MySQL to store the connection data, LDAP (without the custom schema) to perform the authentication.
The groups however, which come in from LDAP are empty - this means that currently I have to select each LDAP user and assign them to the LDAP group manually.
This defeats the purpose of using LDAP groups in the first place, after all the entire idea is that you manage your groups & users in one central location; LDAP.
It would be very helpful if the groups are populated with the members as defined in the respective LDAP directory, this way when a member is added to an LDAP group, the access to the connections is automatically granted.