Provide a specialised Password Manager Hook into all apps
This would be a really cool feature to have for all Windows Form Factors, currently this is achieved either via COM on Windows, and on Android, however, the current implementations of those aren't very safe, because it provides unauthorised access across the System. It would be great if you could request special permission from the User (Like a Notification Manager request), and that would allow the password manager, to fill password forms.
There would need to be some things that would probably need to be specified for that to work, such as specifying a Username textbox. How this could work, is that developers of apps when creating a PasswordBox, have a property for a username textbox, where you could x:bind the Username TextBox to the PasswordBox. There could also be a allowPasswordManager boolean on the PasswordBox, to disallow a Password Manager to access to the PasswordBox, or the app itself. UI for the Password Manager could be inline or via Interactive Toast Notification.