Your Nvidia drivers should enable you to setup a multiscreen group which they call “Surround View”.
For ATI these are called “Eyefinity Groups” and there’s also hardware solutions like Datapath X4, Triplehead2Go (in the past), and others …
Hey, thanks for the help patch, I’ll include this in mp.essentials! That “Update Display Change Delay” pin is for situations where you can’t guarantee that your desired screen stays connected while the patch is running, but you want to get back your content to that screen once it’s reconnected automatically. The delay part is indicating how long should FakeFullscreen wait until it’s “safe” to put back the renderer on the reconnected screen. It’s only useful on venues or installation sites but you can imagine I ran into this problem a lot ;)
About DPI scaling, yup I know this issue for ages and windows ain’t making it easy to get a “pixels/dot” multiplier. It’s on my bucket list but super low priority as I use all my screens and venue displays without DPI scaling.