Yup, like Colin said, there's an <InfoAdditions> block you can add to your app descriptor xml (flash builder should generate one for you in your app descriptor xml and then you can just modify it). Anything in there will be added to the info.plist in the resulting iOS app. There's also a corresponding block for Android.
So, for instance, if I want my app to to be a universal app (targets both iphone and ipad), I would normally add this to info.plist, using Apple's UIDeviceFamily key:
<key>UIDeviceFamily</key>
<array>
<string>1</string>
<string>2</string>
</array>
To do the same thing in AIR, I add the following, inside the main application tag:
<iPhone>
<InfoAdditions><![CDATA[
<key>UIDeviceFamily</key>
<array>
<string>1</string>
<string>2</string>
</array>
]]></InfoAdditions>
</iPhone>
This way, you can directly add anything to the resulting IPA's info.plist file you want, and add any permissions/settings that Apple allows.