[Admins]

Mysql requires setup work so it can only done by us for special purposes. I was referring to enable external databases like WhiteDragon said.
SQLite is pretty fast, at least with the "PRAGMA synchronous=OFF" query. Also right now it's instantly returning (if we use threads then you need to use waitfor()), and with the new serveroption you can easier use several databases and can easier backup things.
The advantage of mysql for me is that it's easier to maintain, you can easier update the database structure and the queries have more possibilities.