There's no use for anything, except for the radio (which gives easter egg messages. From left to right, press any of these button sequences:
2751 3648 1385 8354 4617
(all taken from the Cheats & Secrets Section)). People's opinions vary. It's possible it was put in for an aesthetic touch, but it seems more likely (to me, anyway) that it was going to be used but was removed for some reason (time, enjoyment ect.).
Did you hear the joke about the delicious sandwich? I heard that it's really cheesy...