Sorry to be a pain, but I don't think this extension qualify as "[RC]
I tried to install it, and immediately the phpBB admin pages went blank.
In the php error log, I have these:
PHP Fatal error: Can't use function return value in write context in /var/www/html/test_forums/ext/o0johntam0o/archive/event/main_listener.php on line 123
I've seen there's a post about how to fix the issue, but still the extension should be written [dev] instead of [RC].
Still, I'm looking forward to this extension when it will be ready to test