Reviving thread since mine was locked and all, I agree with the notion. If for the trade forums only as a start so we can view more than 4 trading threads per page on that subforum.
Alternatively these three links
PlymouthJamestown*****Could be used, and probably should be put somewhere in the trade forums as easily accessable as possible. It's up to you if you want to make those search lists common.
Pros to subforum:- It becomes rather cumbersome to filter the server threads and/or search for [server] every time I look for tradings, it might also increase the server load slightly from the searches
- Titles will be less cluttered with tags, might allow more space for other information such as buying or selling
- Main trade forum could still be used for global trading or multiserver setups or miscellaneous threads
Cons to subforums:- Administrators might have to do some work for a change to move all the threads