If I'm understanding what you're asking for it already exists. Press "Num Lock" and select 1,2,3,4 or 5. 1 is fast and 5 is 0.01mm. Click Num Lock off and resume jogging. Homing I don't have an answer for, but then I usually only home my machine when I'm physically in front of my computer, the wireless jogging on a Bluetooth 10-key is great for setting zeros though so you don't have to move, run around the machine and see if it's right, then move again, run around again, etc..