If you must know...
#1- the DVD release schedule didn't catch up to us until recently (the DVD containing episodes 16-18 was released on June 25th).
#2- the original raws we had for episodes 16-17 were corrupted so I needed new raws anyway
#3- for the bulk of the first 15 eps we released, the show had yet to air in widescreen for those episodes so 4:3 was our only option.
#4- we have no plans to redo episodes 1-15. If we were going to redo anything, we'd redo season 2 from DVDs first. That being said, I have lots of other series to work on so I don't see it as a priority.
#5- of course it's in stereo
Hope that explains it!
-Tofu