Since a Mendix app is a single-page application (SPA) technically the only pages you visit in Mendix are login.html and index.html. In this context, deeplinking doesn't make sense, since you will always link to index.html. Anything you deeplink to is a facade, which doesn’t represent the underlying technology.
I created this Idea:
so if you think the page input should have a default value automatically :D give it a vote :D