WPF PlatformWebView size, position, parent and navigation.

Current WPF PlatformWebView authentication window size is fixed to 1024*768, window position is random, you cannot make your main window a parent of this authentication window and if a wrong provider is selected there is no way to navigate back to provider selection and the user must close the window and start over with authentication…

Is there any way to control any of these properties or provide navigation and if not are there any plans to address any of these issues?