Alternative mouse handling for keyboard+touchscreen

[balt-dev]

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Is your feature request related to a problem? Please describe. Yes. If I'm using a keyboard without a mouse, I can move around fine, but trying to move the mouse makes my camera move like crazy.

Describe the solution you'd like An alternate way of handling the mouse so that the reference point for the center of the screen for the mouse is where the mouse started moving, or something similar to that. (I'm not asking for multitouch, I know that's borderline impossible.)