Proportional Mouse Movement across Multiple Monitors?
Currently the mouse can only move between the connected edges of the two screens.

This is by design.

What I would like to do is have one essentially fake being scaled so the mouse can move smoothly between the screens without stopping one half.

You can't fake anything because that's not how things work.  Scaling is related to how the video resolution is displayed. Your mouse is tracked on an [X,Y] coordinate system for each display.  Your lower (smaller) screen only being half as wide cannot be &quot;faked&quot; so the mouse thinks it's 2X from where it actually is.
For example, if it were possible, then if you happened to be at [1,1080] (bottom left) on the upper screen, your fakery would mean as you moved to the lower, you'd be on [2,0] (top left) on the lower.  If you were to implement this to make your screens line up where they don't they actually wouldn't line up where they do.