To improve the identification of surfaces in shaded view it would be nice to have different
edge colors for surfaces in shaded view as it is in wire frame mode.
With this opportunity the user would be able to find out if the geometry is a solid or a collection of
surfaces. If the edges have different colors depending on the status if the surface is merged to the next surface
or not it would improve the work with surfaces in shaded mode.
Additional to the edge color idea the default system color with transparency for surfaces could be improved which is
a related idea with the same scope in this community :
Idea 7357 - Ability to define transparency for default system colors