So many people trading a lot of items / services etc get lost in the massive quantity of threads. Maybe a subsection like the runes ft iso and region option to find easier for newer and to cut down the massive quantities of posts by dividing them up ?

You don't want to divide up the posts as this will create dead subforums as people flock to the one with the highest playerbaae. considering how easy it is to add a user and join from list. It's just not worth the dev time for D2R.