Both of those ideas could potentially be very interesting. For your suggestion, Anthrazit , Modding the radio for ourselves would be a fun new way to personalise our experience of the game. Having something like a song/audio list to use for uploading your own audio files could also be very interesting and wouldn't be too difficult to implement compared to some other suggested features.
For your idea, redspawn , I think that's also very cool but I'm not sure if they'd be able to set up a schedule for it. Maybe if they could though it could be on specific radio channels where you tune in to listen to certain things such as those commentaries and things or music which would also link back into what Anthrazit said.
Edit: There could even be three catergories for radio channels to tune into, these could be 'Music' (listening to your own music you've uploaded), Commentary (Where you listen to a channel run by the staff) and 'Original' where it plays the radio stations that I mentioned before such as lullaby or Professor Oak's Pokemon talk. Those ones would have text with them like in the original games.