The main thing to fix is the dang icons not showing up for assets downloaded from Steam when in game. Basically I dont download any assets other than buildings at this point, since they just become a jumbled sea of non-existant icons. This is single-handedly ruining the mod experience for many people. No point downloading 10 intersections when I cant tell them apart in game - just a sea of duplicate icons in the road menu. Aarrgghh.
I really couldn't agree with this more. If CO could fix it so all the icons/images for all asset types could be somewhat easily added, that would be everything to me. Everything else, like tunnels, is just gravy. I hope we can get that sooner than in 1+ month. The workshop is just filling up more and more every day with items without icons.
I agree with you guys on this, so much so that I took matters into my own hands while we wait for a proper fix from CO.
You can add icons to anything except prop and tree assets right now. I learned how to do it from Lord Rato, and wrote a guide about it : )
See here for guide. Many authors are already doing it I'm happy to say, icons have started popping up amid the sea of white blocks in my menus lately : )