Hey JonnyDex,
if you use a g-code toolpath created by a CAD/CAM software, and you have entered the correct limits of your machine, and the correct bit diameter, it will always subtract the radius of the bit (=half the diameter) at every end of the workarea, to force the bit to stay within the limits.
Of course, you could also go further out with the bit until it protrudes at the edge of the wasteboard, because there is still enough space there. But then you have to trick the CAD/CAM software. Either you make the workarea limits larger, or the bit smaller in the software settings.
The other method is not to use a g-code toolpath program at all, but to jog around with the gamepad.