You may notice that when you start CMJ that the mouse cursor will initially go to the upper-left hand corner of the screen but that you can still move it with your mouse. This is caused by CMJ calling a reset on the mouse driver on startup, but the reset will set x,y coords to 0,0.
Not sure if we will change this in the future. We could pass the current mouse coords as you see in the input/mouse tab as the reset coords. Or reset it to 0,0, then quickly pass the previous mouse coords so you would only see a flicker.
5.1.47.11 Mouse Jumps on Startup
Moderator: DevRuss
5.1.47.11 Mouse Jumps on Startup
Russ - Tetherscript Developer