The doubling up is automatic, it does a good job.
To use the native resolution you would have to compile using the 5.1 SDK, if you haven't done that, it will effectively be 1024x768.
So, don't worry.
I am just using 4.6. I don't think I have specifically updated to 5.1?
Thanks I can relax a little now.
4.6 is Flash Builder I guess. 5.1 refers to the iOS SDK. You can't accidentally be using it, but it is possible to use it in FB 4.6. I'm sure you're not using it.
Oh OK I understand now. I would specifically have to make it compile for 5.1.