If the operation you want is not available on your physical remote and not available in Roomie's command set, it is like — Staff replied: “Yes. In other words, if Philips didn't manufacture the TVs to understand such discrete codes, and they didn't put them on your remote, then nothing can be done.”
If the operation you want is not available on your physical remote and not available in Roomie's command set, it is likely the discrete command doesn't exist.
In the event you were to find such a discrete command on the net somewhere for instance, it could be added to Roomie using the DDK: