This may not seem like a problem: but on multi-monitor machines it can have the effect of moving the mouse cursor out of the DayZ window and into the window of another application, thus on computers running any form of X-mouse system (mouse over = focus) it immediately causes a loss of focus from DayZ and the associated task switching (Kind of a pain when you're trying to get a clip into your gun in a hurry, so you don't die).