[Poiesis]

I would personally choose not to over complicate things and simply make this the app "for when you absolutely, positively, have to be there." If there's a possibility of cancellation, well—you're looking for another app, then. I realize this will decrease the number of times the app is used, but I'd say complicating it would be worse.

[eldog_]

I know what you mean. Biggest difficulty was trying and make it clear to the user how the app works. The more features you add, the harder that can get.