"scenes load, no blurry, no gray"
This can be done in TW4. under publish settings go to the Flash VR tab and uncheck slice display. I would also uncheck Pano size in normal scene viewer option. These where both good ideas in concept but like you I hated the end result and they took even longer to load then just leaving the tour like TW3.0. As far as I know there is no preloading in TW4.0. I agree TW3.0 is better in that way.