Re: What type of staff roles do you care about?
Despite the ambiguity, I would definitely like one for the main composer/music person. Being able to see which anime have music from the likes of Yuki Kajiura, Kou Otani, Nanase Hikaru, Kenji Kawai, etc. seems pretty relevant. If there's any doubt over who the composer is for a particular series, it may be possible to look up who is given the credit on the ost cds and use that.