SQLite support?

The databases that TPAS is planed to support include: MS SQL, MySQL and Postgresql. We are also considering SQLite. SQLite is a file bases sever that runs as an extenstion to PHP. The main and significant advantage to using SQLite would be that it doesn’t require the user to have a full-fledged SQL server running. The big down side is that it does not support all the existing SQL commands, or the support for the commands is unknown and sketch. Is this a feature that should be persuaded? Would it be useful or extraneous?