Is there anywhere that screen resolution can be set for the users at the domain group policy level?
There is no direct option for doing this in group policy.
What you can do though is write a startup script to do this for you and assign that out via group policy. You'll have to rely on a third party application to change the resolution. I did this once before and was able to find a free one. On my (very quick) search right now, I was only able to come up with this option.