I know this has come up in many, many, many discussions; I'm surprised I did not see it in a wish list item here when I searched for it.
A client just asked me today if it was possible to hide the x/y/z (project origin) in 3d. He is trying to use the model to grab screen shots, and is tired of clone stamping out 'quick' screen shots to send to clients to get rid of that orign.
Could be a 3d style toggle, work environment toggle, or some other control to hide that? I know a lot of architects that use the live model in presentations and just take screen grabs in lieu of full renderings for quick sketches to consultants, builders, and clients; and the project origin is just the distraction any one needs to derail a presentation/meeting with a question like "whats that?"