Windows Logon background maximum size appears to be around 2100 pixels horizontally. Is this possible for DisplayFusion to override background drawing and fill entire screen not only center of it?

I'm using DisplayFusion v6.0.0 (Beta 5)

I don't believe this is possible, at least not with Windows 7 (I'm not sure about Windows 8 ). Windows has a hard limit on the maximum login screen size (2560 x 1600?), and the Nvidia drivers don't load until after you login.

If anyone knows differently I would love to hear your thoughts. I've come to accept the cutoff login screen but I wouldn't be opposed to spanning it all the way across my monitors.

I think you're correct.