During app creating it is necessary to select, for what use-case the app is intended.
Does this lock the app into one specific mode of operation?
Or is it possible to switch / extend it?
The main question is: Would it be possible to create a Shopify app, that also acts as a web app?
It would be installable in Shopify and would also expose a login page to the web. Logged in web users could interact with some settings, that would be saved into the database and could affect how the Shopify app behaves and what it shows.