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The scene can be changed at resolutions below and equal to 8 MP,same for HDR.
For the second thing,could you post a picture?
Request desktop version.
We cannot tap on the scn even on Z1,probably it just tells you that you are on a scene which you can edit with the functions given.About the data limit,it could be a simple notifier every 500MB.Contact xperia care for more info:
http://www.sonymobile.com/global-en/support/contact-us/