Make a quicktext with the command and/or perform many custom actions quickly after eachother, you'll see it will screw up.
This is because events are fired before the actual event occurs, not afterwards..., using timers is always tricky and errors could always happen because of timers triggering too soon or too late..., and you can't catch a message being interpreted (the /me command being processed on screen and "« I" being replaced by your nickname) with scripting...
So, you can't make something fail-proof for this, unless you revert to making a proxy and sending your own messages directly via the protocol.
In other words: your script might work, but it will not work perfectly
/ 
