Why I upvoted @MiniGrief's post. ^
No, there is no official way at the moment. Messing with the SQLite DB via PHP is unreliable at best (if they're already in-game it won't be able to kick them, and so when they save it would overwrite any bans you added), and dangerous to your data integrity at worst.
The best shot you have of doing this safely is to *hrmhrmhrm*decompile the engine to analyze the WebSocket packet structure and try to pipe your commands through a privileged account that way.
That being said that'll probably be harder to do than just waiting for MySQL.