This seems to have always been a setting that existed for a long time in Linux desktops (or at least cinnamon), I've had this enabled before, sometimes it's goo

This seems to have always been a setting that existed for a long time in Linux desktops (or at least cinnamon), I've had this enabled before, sometimes it's good, sometimes it's not when you want to use mousepad and keyboard at same time for some game (but then plugging in a USB mouse is better anyway)