I definitely want this. It's something that every GPS I own, or have ever owned, has. During my tests with Navigon it was not perfect for me. In town, for instance, I wanted to zoom in so I could better see side streets as they came up. But soon as I touched the screen it changed to a different view. I just don't like that behavior, that's all.No zoom in driving mode - Im not 100% sure why you would really need this. The navigation is perfect as it is, I have yet to find the need for zooming in while in driving mode.
The demo doesn't do this at all without Backgrounder. Sure you didn't have it enabled, as other reviews at the app store are complaining about it.Start from scratch after phone call, etc - Not altogether true.
I tested this yesterday with both Backgrounder enabled and disabled. Both times I took me right back to my route, it took a second for the app to load but once it did I was right back on my route.