Once you do get around to offering PHP, how about being different? And make it PHP5 only. Since PHP5 by default supports the SQLite database, which does not require a daemon, I suspect it will put less load on your servers, although maybe more, because more people would be using it, once they learn that there is less fuss.
Absolutely, we will make Sqlite one of the database choices. It is a very well designed database. You connect to the database using a simple file open, not sockets. And the database file is located in the users directory. We like Sqlite very much.