I don't think such an option is a real need.
1. If one has already the album, he/she doesn't need to go on the PA for such data (like songwriting and lyrics credits); a search in the album booklet should suffice. If there is no such data on the booklet, sleeve or official site for him/her to consult, why would you think there's a better chance that PA Collabs would be able to do such a difficult documentation?
2. If one hasn't got the album, the presence of the data on the site is useless - what good would it do to you to know who wrote the lyrics of a song you can't hear (except for the case it's streamed here on the site) ?
3. I think it's a logical deduction to state that resuming to basic info for albums helps at not encouraging illegal download... which is the third option in this scenario. Let's keep people curious. If one wants the "full package", let him
buy.