When changing controls, "dismount" seems to only work for getting off the ATV. All other objects/items (PC, scanner, console, notebook, etc.) require pressing ESC. Using 0.7 dupe debug version, but this existed on both other versions of 0.7 (haven't tried "at your own risk" version). I don't believe I ever changed controls in older versions because of other issues I foresaw, so I can't say if this is new or has always been that way.