Nice list. I've been browsing through the core_en-us.tlk file to modify ability tooltips for a mod and I bumped into these descriptions which give you an idea of what each of the party members like, identical to that list shown above. Loghain likes maps (tactical freak), Wynne likes books, Leliana likes religious stuff, Alistair is fascinated by magic and likes magic runestones and depictions of fantastic beasts, Morrigan is a total skank, is particular about her appearance and loves jewelry etc.
Not sure if those descriptions show up in the game somewhere. I think the strings are perhaps codex entries after you've talked with them a bit. They might have even disabled them from showing up in the game - worried it might give things away about the gift system too much.