How do I set the DVD region code via ARD?

We recently deployed around 200 MacBooks in a k12 environment and manage them via ARD & WGM. We forgot to set the DVD region when creating our master image and as a result, every single MacBook prompts for an admin password when attempting to use the DVD Player to view a DVD for the first time.
Instead of attending to each of the 200+ MacBooks personally and putting a DVD in and setting the region code one by one, is there a way I could do this via ARD? Unix command? Managed preference via WGM? Thanks, I appreciate any input.

I've been working on this very topic for about a year. Here's what you need to know.
1) setting the region code on your master image would result in the same behavior. Setting the region code triggers an update to the DVD drive firmware itself - it's not something that's stored in software. Obviously this is something that needs to be set on each machine individually. Setting it on the image won't affect the imaged-machines.
2) Apple seems to have gone to great lengths to hide the app that triggers this action. If they had provided a simple CLI interface to trigger this on a client machine we'd be able to use ARD to trigger the action on all of our client machines. Alas, this app is buried somewhere I can't find and seems to only rear its head when a DVD with a region code is inserted into the drive. There is one idea that popped into my head while at Macworld that I want to try to see if I can find this app but I have my doubts.
3) Failing my last ditch effort to find this app, I think our fallback will be to give users explicit rights to set the initial DVD region code on thier machines. This is something that can be done using WGM. There is a rule in /etc/authorication specifically allowing users/groups to set the region code for the first time. According to the notes, giving this access will NOT allow users to change the region code - which is a good thing - but only give them rights to do so the initial time. This way, we can empower our users to help themselves while also protecting them from resetting the region code accidentally.
In conclusion, I haven't found any way to script/push this command to a client machine. I'll definitely file this with Bug Reporter and hope Apple will give us a CLI or an ARD command to trigger this action after imaging.
G4 Mac OS X (10.4.8)
G4
G4

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