I'm pretty sure there is no easy way to get this to change..... It is populated by open documents, so the only thing I could suggest, is that you only have open what you want to appear in the drawing view palette.
I thought this, as i have tried everything!
Only thing with your suggestion is that if you have 15 parts on a drawing sheet the name shows up in the drop down on the view palette wether the part is open or not. ( or is there a setting to change this?)