Amazon's documentation is surprising lacking in information about the submitting binary process. From what I can tell, you submit an unsigned binary and they wrap it in their own code and produce a signed apk?

This leaves several questions:

1. Does the Amazon App Store perform a zipalign for you?
2. If you have your app in the Android Market (Google's) already, is it recommended to use the same package name or a different one? Does it make any difference?
3. I also saw elsewhere, that they offer the option to download the apk they prepare and sign it with your own key. Is it recommended to take this and then sign it with the same key you are using in the Android Market? Does it make any difference?

Are there any other considerations or pitfalls that one should know before diving into this process?

Thanks