When in an Assembly, I would like to be able to select a component, either in the model area or the tree, I would like to be able to see all of the edges of the model, and not just the visible edges. When I say visible ones, I am assuming the "Visual Style" is set to "Shaded".
This would aid so much in seeing how things line up, or checking for interference, without having to change "Visual Style" to show hidden lines and clutter up the assembly.
This screenshot is from ProE. Note that I did not make all components in front of the component of interest transparent. I simply selected the component, and it shows me all of the edges, both directly visible, and those that are behind other components.