Issues with tolerances - SO3 XXL

Is it possible to command the shapeoko to move by a set amount (say 100mm) via carbide motion or do I have to individually press the xy jog buttons a 100 times? Also, for the sake of ease of measurement, could just measure the movement of a specific point of the gantry (lets say i measure how far the edge with the limit switch moves) over a distance rather than trying to pinpoint the dead centre of the router bit?