I wouldn't doubt if your class isn't running classroom management software which makes bypassing pointless. Anything you do to make the software not run and the computer is flagged on the teachers control panel. Any exploit to run software and the teacher has full access to your screen.
We use Faronics Insight as our classroom management software for chromebook, and by far, we successfully deployed it in 7 schools. The secret of its stability and efficacy lies with its powerful Tech Console which can be centrally managed. Thus, we can view the summary information related to all hardware components and software installed in each student machine from one central computer. Keeping a track on the IT inventory and asset has also become an easy job. We can also review and analyze reports on application usage and list of websites visited by students. As there is a single console at play, we can provide remote support to both the teachers and students. Thus, the number of IT service requests have gone down remarkably. In my opinion, Faronics Insight (http://www.faronics.com/products/insight) works quite well for Chromebook.
I dont that will go over well :P they have some sort of 'RAT' called Faronics Insight Which would make them freak because they wouldnt be able to monitor activity on that Hackintosh ^^Boo ^^Hoo
Sounds like you might be trying to manage a classroom or lab full of computers?
I don't have a free answer for you but looking at classroom management software or related solutions might help. I've used this insight from Faronics to manage classrooms before and it worked decently...
http://www.faronics.com/products/insight/
It also might be worth looking into alternate ways to accomplish what you are logging in for. Powershell, Puppet, etc....