This is an IDE-specific question which should be directed to the dedicated Flash Builder forum.
Yes. It does not show 'XML' in 'Configure return type' wizard.
This is not supported yet.
Please file an enhancement request.
Again, this forum is for the SDK and not the IDE which has its own dedicated forum. If you want your IDE feature request to be seen by the right people, you should post it in the appropriate place.
ok, will repost