I've read much documentation and in the end I have reached the point where it just becomes a feature request.
Is it technically possible to include a subtitle file with a stream? I would think that even the current SubRip (.srt) subtitle format is feasible enough (with it's time codes) to use it as a subtitle streaming file in the DivX WebPlayer.
I however do understand that the .sub and .idx files will probably never be possible because of rendering restrictions.
PS, more information about the SubRip (.srt) format: http://en.wikipedia.org/wiki/SubRip
PPS, thanks for the WebPlayer 18.104.22.168 update (it solves many problems we were having)