Phil, as Daniel mentioned you are currently
limited in your relabelling to fit within what
they allow as 'button limits'.

You are right, some screens, say for example a 'keypad enter' or 'menu navigate' screen could have 10-15 smallish buttons while other screens may have only 6 or 8 or so. The larger buttons allow maybe 20 character labels and the smallest only one or two char at most. There is also a selection of icons/symbols available that you may
typically see on a remote. All labelling is
carried out on a nifty 'zoomable' standard
keyboard that I'm sure someone got a raise over.