I'm not sure if this has already been suggested, I looked over the suggestions board and couldn't see anything related to this.
As a deliverer for a giveaway, my private threads can be quite hectic, and there's usually a lot going on at one particular time. To make it easier for other giveaway employees, and those ACC members who also have a lot of PT's, I think that it would be a nice idea for each member to have the ability to organise, sort, and file their PT's, to bring order to the threads. This could be done by allowing members to make sub-folders, and allow regular members to make sticky threads within their own PT's.
I'm a bit of a perfectionist, and I love to have an order in the things that I do, but usually my PT's get so unorganised that it's very hard to keep up with, and it can get very frustrating.