You can install roll cages in some vehicles: not only is it safer, but it improves chassis stiffness and vehicle handling (use [action=parts_selector]).
You can navigate the menu using a controller [action=menu_item_left][action=menu_item_up][action=menu_item_right][action=menu_item_down][action=menu_item_select].
Operating an engine upside down causes oil starvation. Blue exhaust smoke will occur from oil submerging the cylinders, and the engine bearings could fail.