I'm sure I'm not the first person to come up with this, but would it be possible to have "blender-style" sliders where numeric/percentage data are being adjusted? Then it would be possible to see the numbers "as you drag" and reach what you want more easily, without having to keep jiggling back and forth all the time.
PS I've noticed that adjusting the age slider seems to alter the height as well. I'm not sure that this should happen...(?) At least not over the age of about 20
For younger ages, proportions will change, but otherwise, until old age when the intervertebral discs start going and shrinkage of the spine occurs, the height should remain pretty much fixed.
PPS the measure tools are extremely useful!
/G.