Employee IT skills?
I admit I'm not IT, but it seems to me that the biggest danger here is that any real intrusion is lost in the deafening noise of random employees clumsily banging at the doors. Also, I don't think those employees will be able to find anything remotely useful, given their total lack of IT skills. Don't forget that if it's easy to hand somebody clueless a bomb and tell him to go somewhere, it doesn't necessarily mean you can easily train him to detect bombs.
I can't really imagine a HR, accounts or marketing person searching and finding ways to bypass corporate security (beyond the usual "click on something you shouldn't have clicked on"). It will just raise the noise/signal ratio for IT.
Biting the hand that feeds IT
