I made a discovery, making the following possible. Not the same as true scrolling LED signs but hey, it's Minecraft. Making this function is just a fraction of the work I've done today:
EDIT: Actually can someone help me? I know there's some way of editing the LED text in both AO and AE, so there must be some way of also extracting it. Does anyone know of a list somewhere of all the LED sign text from both games? I'd save me the trouble of going into the games to extract it all manually.