Lumu and/or Luxi Support
Add support for either of two incident light meter attachments available for the iPhone (Luxi now shipping and Lumu with 1272 Kickstarter backers.) It would be amazing if the Lo EV and Hi EV auto filled from the meter so users don't have to toggle between two applications.
I think it would truly be the first BTZS light meter. Phil Davis wouldn't believe how far the community has taken all his hard work and made it so user friendly.
I've contacted them for info on their SDK but there's nothing available yet. I will look into doing this if it can be done. I missed the Kickstarter campaigns though so I won't have a device anytime soon to try. It would be the killer feature for ExpoDev.