First of all, thanks for the wonderful job that you have done with the Repetier software.
Has the idea of a "Calibration/QC" tab been proposed or discussed yet?
I would like to see one that has programmable buttons (text on button is also programmable) to simply the process of doing bed leveling/checking probe repeatability/etc. It should reside next to or before the SD card tab.
I would also like to see some type of a logger in the same tab that I can reset which will tell me the amount of filament that has gone through a hot end. Could be helpful in determining when a hot end or nozzle should be replaced or if it has suffered a premature failure.