Feature request: DJing extension

With the new GStreamer core it would be supercool if there was an extension that would provide some djing features.
It could implement a media view that has multiple playlists which could be manually crossfaded and each streamed to different sound device outputs.
Advanced looping functionality would be cool, too.
Perhaps something like this http://www.hobnox.com/audiotool.1046....? where several audio effects are looped in a Flash interface could also be done in Javascript connected with GStreamer.

Given that my programming skills are limited, I come up with these ideas, hoping that someone could find them realizable.