A Shadowvein Expansion?

So I've got each of the areas in underground player's map below fleshed out (In The Pod-Caverns of the Sinister Shroom, Down the Shadowvein, and The Mouth of the Shadowvein), but on the GM's map  there are about two times as many potential places to flesh out as shown below. Part of me thinks I should slowly work on each area and then release an underground wilderness-crawl. I think that given the relative low-level of the adventures (2-6) it could turn into a good resource for GMs to raid for their own campaigns.