When I try moving down, I keep scrolling the webpage down. Maybe add WASD movement?
Huh, that’s strange. For me that only happens when the frame loses focus (due to scrolling with the mouse or clicking off the frame), and in those cases no inputs are registered at all (so alternate controls wouldn’t fix it).
In any case, I’ve added WASD and the numpad (that is, 8426), in case someone is not using QWERTY, as alternate controls.