Gamers that have 2 or more monitors know the pain and frustration of playing a video game and suddenly your cursor jumps on a different screen, outside the game, making that perfectly timed blink (that was supposed to get you out of trouble) useless.
Thus, I strongly believe that we need a (toggle?) option that prevents the mouse cursor ever leaving the game window.
Agree. Had the same problem while streaming. I can link you a program later that you just have to run and it will prevent the cursor from leaving the game unless you alt-tab out.