Did I say how awesome this player is?! No need to port anything to gst-0.10 as just about every codec in existance has been working for years, heck even a decade for some. Speaking of which, I found this site:
http://www.auby.no/files/video_tests/

So I was testing a few there and they all worked perfectly, even the xvid Matrix trailer. But the Matrix trailer has eleven different subtitles packaged so I was thinking of making another feature request. Enable/disable subs and possibly also chose between multiple ones.