The most likely way a coder would take this on would be for a paid exporter extension.
There is one developer who specializes in game engine exporters. Their extension is ~50 dollars.
If anyone is to take this on, it’d likely be this developer.
The export extension is PlayUp Tools Exporter
http://extensions.sketchup.com/en/content/playup-tools-exporter-0
The developer’s nickname here on the forum is @nintari, (this will serve as a ping,) or you might PM him Benjamin (@AsroiluIMVU) and ask if he’s interested in adding IMVU support into his PlayUp exporter :