Hi Brian,

re:
> A quick search shows that some CAD programs use "Spline Leaders," and "Arc Leaders."

I would like to have an option for the leader to be a spline curve instead of a polyline but it won't be for version 4.


> The arc leader in Autocad had a slightly curved arrow.

Yes, that one seemed pretty weird.


> So a guess would be that dimensions represent a special kind of geometric
> object, not subject to many of MoI's commands?

Correct, they are a distinct "Annotation" object type. They have their own new area in the "Types" section of the scene browser. There are 5 different sub types of annotations currently: Linear dimension, Radial dimension, Angular dimension, Leader, and Text.

There are several commands that can work on them like Transforms, Delete, Copy, Paste. But not model construction stuff like Extrude, Revolve, etc...

- Michael