Yes add a new database in ISPConfig as you normally would. Make a note of the name and password. Then log in either as root or as that user in phpmyadmin to run the SQL query. I usually log in as root to run the query because your new roundcube database user will have limited privileges. You should see that ISPConfig creates the database outside of the dbispconfig.
Last edited by CSsab; 31st August 2011 at 15:46.