manual Z home triggering

More of a firmware than software question. I am focusing on small, highly detailed parts and am finding repeatable nozzle height to be a challenge. If I could use my 2" tall tool setter , manually trigger the limit switch then enter 50.8mm (or some other clearance value) in Repetier- "Z height offset" theoretically this issue would be eliminated but haven't a clue as to how I would mod the firmware to accomplish this. Can someone help?

 

Hi 330SC, have you downloaded the updated firmware? http://www.robo3dprinter.com/pages/robo3dsoftware this comes with matter control and automatically updating firmware. The new firmware should help with this issue.