1: I don't think you will be able to export to any app store in under 48 hours. At least not any that demand revue. Export to browsers that those devices use is basically one click publishing.
2: The constraints are pretty much the same as native, IE too many objects, graphics intensive, etc, with the caveat that there are a few quirks to the logic that can get you into a bind.
3: All that is needed to make specific types of movements is there, and there are a few third party plugs that are somewhat useful. The engine does not give you much as far as pre-configured things go, since there are way to many different ways to do so.
4: Its a 2d engine, with 3d support from third parties. In other words, not reliably.
5: Weekly.
6: If I were to get another computer, C2 is the first thing I would install.