hi mate,you could incorperate an i pod jack in say under cab for an unique feature. 
Not such a silly idea (sort of)
It would probably be quite easy to set something up where you could add custom sounds for certain events in the game.
Of course you wouldn't use an ipod (too expensive) but a cheap mp3 player or an IC with separate amp and its own speaker would do the trick.
I have thought about this for my Buck Rogers to add the Tweaky "bida bida" sound.
