Feature requests: spherical geometry
It would be nice to have a tool for spherical polygons, starting with lunes (the region between 2 great circles) or even hemispheres. I can probably figure out how to make lunes with the Surface command, but my students can't.
Also, a tool for intersect surface with curve. There are tools for intersecting two curves, or two surfaces, but you have to type a command for a curve with a surface.
P.S. I love this software. I have been teaching linear algebra and it's very useful. I especially like View in Front Of.