... split the end into 2 edges and then use Construct > Blend to put a blend surface between those edges.

Thanks Michael. I just tried it and it works very well.

I'd sure like to see this automated with a script :) I know it's a special case, but one I could have used many times when using a circle profile.

Kinda like the special case "Pipe" script, except this one would produce rounded-end bars.

Ed