There are an infinite number of ways to bypass your "checks" - don't pretend otherwise.
I never said it would be secure, But you easily can block the biggest threats: Idiots.
You might call me a idiot for developing this addon, But there surely are some good uses for it.
The event system can be used to F*ck with people too, Think of infinite adding velocity to the player.
Now, Badspot added security features like no client and player with the OnRelay, And /cancelEvents.
But most of the people i know never heard of /cancelEvents and it still can be abused. So most are screwed in general when they activate a brick with events of this kind.
The use of this addon can be limited to host only, Or password/BLID only. The server owner can decide who to trust to upload / exec scripts.