I'd love to see an "extrude along path" feature in AC3D.
It would basically work like this:
Figure 1: a Disk and a Line
Defining the Line as our "path", we could extrude the Disk and get this:
Figure 2: extruded Disk, subdivided in 3d view.
This exercise was done by hand --- I started on a plugin to do just this, but I'm having problems getting the rotations of each extruded edge right, so have abandoned it for a while. Thought it would be a nice-to-have in the app at any rate...
Dennis