Ok, I think I see where you are getting at now, thank you.
We showed 8x 4K at the Consumer Electronics Show a couple of weeks ago, and I don't believe this was a push-back we received. People moved windows around, straddle them across screens, but didn't extend them to fit multiple displays fully.
I'm wondering the size of the market for this. If you put something as a wide array of many displays for advertising, something like BrightSign comes to my mind.
Our solution is most optimised for productivity.
I will discuss to gauge interest. In the meantime, I could advise the free
Dual Monitor Tools.
I set my primary display as the top left origin and then selected an area the size of the desktop. I have three displays of different resolutions (2 x1080p + 1 Surface Pro 3) so it can handle non-rectangle desktops.
Then that shortcut is used to maximise across displays.
Kind regards,
Alban