Aibility to set the step/mm parameters during machine set-up

Could it be possible to add a menue giving the possibility to individually set the step/mm parameters during the machine set-up. Especially for the z-axis, as the choice of acme or 8 mm rod resets the parameter to unwanted values when you have an upgrade on the machine…Or a simple box saying “OTHER” and performing no change to the existing values.would allready be helpful.