The idea is to drop in and replace jquery on mobile.
The developers are the ones who know what functionality is replicated and what isn't- going through myself and testing seems like a huge waste of time.
Not really, just run the Backbone test suite and substitute jQuery/Zepto with JQ.Mobi. It shouldn't pass straight away because I'm pretty sure that JQ.Mobi is missing a couple of the functions required by Backbone (see my post a couple of levels up) but it probably wouldn't be a huge deal to write them yourself.