Feature Request: Define custom Height Unit size

[63427083]

Right now we can define a Custom Height altogether, but for workflow reason i'd find it much more compelling to be able to define a custom Z or Unit height.
i.e. use increments of 10mm instead of 7mm.

Given current options, i'd put it somewhere in the zz Expert Only region.

[greg19]

The property you are looking for is HeightUnitValue, it's true that it is currently read only. For a workaround, you can execute FreeCAD.getDocument(<youre document name>).getObject(<your object name>).HeightUnitValue = 10. We allow for adjusting x and y size, so I see no reason why we shouldn't allow adjusting height. If you feel like it, you can find where is the property created in code and create a PR with the fix, should be a quick one liner.