Love the fact that this is being worked on but I agree with the 4 points brought up by @skysurfer to make this usable.
In addition to his 4th point, it would be nice if you could edit the dimension inside the viewport, without having to go back and forth between the side panel.
And I guess to make this something I’d perhaps use a lot would be if this would not only apply to 2D drawings but 3D drawings as well and have Commands like ExtrudeCrv linked to them with a way to change extrusion length etc. But perhaps that’s just me focusing a lot on how parametric modellers work so it’s perhaps a bit hard to see how else you could use this feature.