I don't use my Sky+ remote to control the TV (Philips 32PW9617), but after seeing your post I decided to have a play
1st thing I noticed is that when you put the remote into TV mode, it switches the Digibox to CVBS out instead of RGB

obviously, pressing Sky brought it back but it's still annoying!
Volume, text, channels etc. are fine as expected.
Play contols the aspect ratio.
The colours control the "useful"

feature of Nextview categories!
The "help" button cycles through the AV inputs.
BackUp takes you to terrestrial.
That's all I could find!