I would like VW to add a "ghosted" render mode like Rhino both for editing the model and for presentation in sheet layer viewports. Its incredibly useful because objects feel solid but you can see a faint outline of things inside or behind them. It makes many modelling tasks much easier without having the information overload of wireframe.
Not really. The "ghosted" rendering looks through single objects. For what you're suggesting to work the objects would need to be separated by layer or class.
Here's a comparison of Rhino's ghosted mode (its OpenGL in the editor I believe) and VW OpenGL. Rhino is much nicer to look at / work with for all sorts of reasons.