Is there something that can be added to a member's name on the list that indicates what status they are in?
It still boils down to the fact that members would have to use it. This has been talked about more than once. That is why some members have put it in their profile or turn off their trading so the other members can see it.
You would think if you had a FS/FT list and a Want list you would be willing to trade or sale but that is not the case for all members. I have no idea why, but it is what it is. There are a number of members that will not reply to trades or messages that is just the way it is. (Here and other sites)
At less here you can find members that have cards for you without looking through a long list of cards you do not want to try to find a card you want, even if they do not trade or not active or not reply.
Out of that 100 members did you find any that would trade?