I would like to see the tube tool have a choice of profiles to enable that tool to create shapes other than a round tube. Square profile, rectangular profile, etc.
But even more important to me would be a built-in feature to remesh the sculpt so that it is easy to export it to other 3d packages for character animation. Something much like the Remesher in C4D which I believe had its origin in ZBrush.
I want to add that I absolutely love Nomad Sculpt. It is a wonderfully designed app.