thehen do you or anyone you know have plans to address Universal apps and audio? Did you do this on your own? I know that C2 itself has the WP8 exporter, but it was pretty much useless to have that without your plugin since the back button stuff was required.. 8.1 clearly needs a similar solution.
I ended up going back to making an 8.0 app with your plugin and that worked fine and got approved. Although I do notice a looping music "pop" and playing music also has a noticeable pop, but I'm not sure if it's me, C2, WP8.1 or what. it's interesting.. it just seems like its all about "music" clips... there must be a link between 8.1 and these audio issues..
this is the version I have now.. i removed the 8.1 version since 99% of the users out there don't have 8.1 yet and it was so broken..
The new universal stuff is pretty nice.. Linking an app name to be reserved for both Win8.1 and WP8.1 is cool. It's also nice to be able to make an 8.0 version beside the 8.1 version so you can support older OS and folks who upgrade to 8.1
It's great to know that all 8.0 WP devices will be able to upgrade (no "buy a new phone" issues there)