Add support for sufixes. and [DOMAIN_NAME] and [DOMAINID] var
Have only option to use prefix. why not choose beetween prefix and sufix for database name, client, ftp and ssh.
Use of domain name or domain id turns more easy move sites beetween clients. move directory re-links and run a chown ower of files recursive.
can make user names for ssh and ftp like this: user#domain.com or using @ name@sufix sufix can be DOMAIN NAME or DOMAIN ID.
Database user using DOMAINID and choose a domain of database with a combobox. My opinion it´s more sense link database to a domain not for a client. turns more easy pass a database and sites beetween clients.
Ispconfig modules are independent, using domain id/domain name it´s a interessant idea for some features.
Im using ispconfig3 on prodution enviroment and i think this idea using it.