As far as I can see, the KDL-40Z5500 is only able to do PIP in the following configuration:

• main picture: external input
• small picture: TV tuner

Is there a way to either swap both pictures (only audio can be changed according to on-screen text), or use PIP with two arbitrary inputs (i.e. HDMI1 and HDMI2) rather than being forced to always show TV tuner? The same applies for PAP.

If not, could these features be added through a firmware update, or are they available in recent models?