Transfered from the EAP Ideas list.
With Feature Solids, profile geometry used for protrusions, subtractions etc are stored with the FS element / Cells. They can be displayed on screen when there is a need to re-visit and edit the profiles. This is much better than just relying on the user to use 'Construction Class' as turning CC on would display all such geometry, not just the geometry in question.. creating chaos on screen.
It would be good to be able to extend the way the constraints glyphs only show up when the user clicks on the constrained element(s)... to include profile or 'reference' geometry.
Reference geometry will include open geometry like lines, points, coordinate system planes etc. Looking at the way Template Driven Solids work, some the profiles would be either be in the active model 'container' or in another Cell or Constraints Group.
The 3d coordinate system planes can resymbolised as 2d lines when viewed perpendicularly ie when the view to aligned with the xy coord system / sketch plane, the yz, zx planes would display as lines like 3dAxes.
Since a lot of the constraining profiles will be on 2d planes, the constrained profiles will need to be oriented in 3d to make them usable. As a minimum, the should be a triple group of xy, yz, zx 'workplanes'. Its kind of hard to use 'normal' geometry to show an infinite workplane, so a re-symbolised proxy -view dependent- graphic seems to be the popular approach.