Hi Ken,

It took me a while to notice it, but MoI
does have an option to type in a diameter,
-click on the drop down arrow to access it.
Checking off "vertical" is also a good thing,
if you're used to drawing rings with
the finger opening in the front viewport.

Construct - Planar is the same as Cap, better
in fact, because the cap is automatically joined
to the object. I think Michael is waiting to add Patch
and other more advanced surfacing tools
after the basics are bug-free.

Regards,

Jesse