Hi dew,
in showFeed.brs there is 'Function parse_show_feed' at line 115 and in there you should see a whole block of "item.SOMETHING = validstr(curShow.SOMETHING)" starting at line 130
This is the area you are concerned with. In our version of this file, we added:
item.Director = validstr(curShow.director.GetText())
item.ReleaseDate = validstr(curShow.releasedate.GetText())
and in the XML files we have (for example)
<director>Bob</director>
<releasedate>Released: 2008</releasedate>
I'm not sure how these will get output; since it's been a while, I tried looking in the DesignGuidelines.pdf Section 4.4 Details Screen but it's pretty vague as to how the Metadata fields work so I guess you'll have to experiment a bit.