There seems to be a gap in ability to create construction planes that I have run into previously on a number of occasions, but always thought it would be added at some point. I guess we haven't gotten to that point yet.
There is no easy way to create a plane using a circular edge. Imagine a cylinder floating in space, with both ends of the cylinder being spherically concave (typical bi-concave lens). Try to create a plane for mounting one of the concave faces. Seems like you could just pick the circular edge at the end, but that is a non-starter. Related problem is trying to make a plane on the end of a hollow conical object, either an internal or external cone.
The idea would be to create a plane using a circular edge. Could be very useful, to me, anyway.
