Michael - Would it be possible to have a circular selection area? Just like the make a circle from center command but with selection internal of circle or external of circle.

Start command
plot center
plot diameter
mouse inside of circle would select contents, right click to close tool
mouse outside of circle selects things outside of boundary circle, right click to close tool

I do a lot of radial arrangements and cylindrical components that are nested in each other and it would save a lot of selection time this way.