This sounds do-able and make sense!
I'm wondering if it would be worth doing something similar to the Group Orders forum in that members state what part of the world they are in as part of the topic title so as to prevent confusion; I wondered about the possibility of having separate Giveaway sub-forums in the Sales, Trades, and Wants sections but a single forum would probably suffice.
I think my one concern would be that the number of different categories across the forums has increased quite a bit over the last few years, and we don't want too many so as to not overwhelm people. Equally, a separate category would probably be very beneficial!
I'd advise sending your suggestion directly to Matt as only administrators can create new categories so his word is law in this particular matter.
Thank you for sharing your thoughts!