I would also really like this option, infact I have an idea to base a whole website around such a feature.
You’re right though it would be useless if all of the file prior to the required section needed downloading first. I understand if it’s impossible to load just a section of an mp3. However it is possible to skip to any part of a youtube video and load from that point, surely this is a similar sort of thing?
Perhaps it took youtube’s army of coders months to make that work. Still it would be a great feature!
Cheers man.