Hello A.,
on simple bodies this works fine - you can readjust the height via the control box as you described or you can simply push one face in or out to your specific measurement.
The problem arises when you try to adjust the dimensions of some tapered body, especially if you derived it from revolving a sketch so that it isn’t constructed out of simple geometric bodies.
For my adapter I could identify an uniform part that could be cut and shifted to achieve different lengths without the hassle of tapered structures, but this was just luck.
Cheers Chris