My suggestion is this:
To be able to set a "Preferred sub-forum" in the trading forums that have multiple options so that, upon entering, your preferred forum will already be highlighted.
For example, Diablo 2 forums are now combined in to one, having to select either Ladder or Non-Ladder depending on what you play. More often than not, I will return to the USEast forums to browse topics, unknowingly entering a Ladder topic because I saw something I liked, only later realizing its not NL. Anytime you select 'Ladder' or 'Non-Ladder', the selection only stays until you leave that page. If I jump between the ladder slasher trade forums and diablo 2 forums, I have to re-select non-ladder every time.
I understand this is only a minor inconvenience, but seems like it would be something that could be implemented relatively easily.
Apologies if this has already been suggested and denied, I don't spend a lot of time here.