For what it is worth I have emailed Philips, I figured the more people that do it the more likley they might take notice.

For one brief moment I thought I had a work around... I configured a button on a hidden page to have the special function "backlight", pressing this lit the hard buttons, so far so good. My next step was to call this button from another. Did it work? Did it hell. It would appear that you cannot call special functions from another.