The cylinder primitive could have an edge bevel option with control for radius and resolution. This way you could make softer ‘pill shapes’ for blocking in things like limbs or fingers.
A screen space annotation tool would be helpful for design edits of your model in 2d before committing to changes in 3d. I use the Epic Pen app in Windows to sketch over zbrush models and it is a handy way to study, iterate and improve forms and silhouettes of 3d geo.
This is great news (re: annotation). A simple version without all the bells and whistles of Blender’s Grease Pencil would be very useful from a design standpoint.