1.Does it also have a track for the AO as well??

2. This question is directed at the small box expansions: Is it possible to just buy the expansion on the app and have all the features from it or are some things left out??

The app only has encounters etc so you need the boardgame to play it, but this makes it faster with some people using this for dices, location cards etc. Anyways stuff like common items etc are missing.