Hidden/Unused features?

Have any of you tinkerers dug into the clips’ software and innards and discovered something that could be enabled in future firmware updates? I was wondering because I am assuming there shouldn’t be any reason the headphone jack couldn’t double as a line-in jack. I know someone with a little RCA MP3 player (Pearl th1101) that is capable of recording from external sources.

Do the two and four GB models have line-in?

Nope–models are the same, apart from storage capacity and external color/coating (and the 4gb supposedly has a brighter screen capacity via the software).