Lots of the flats from demo 4.3x have been removed in FD (HPZ, Wood Zone, Rocky Mountain Zone, just to name a few). As a level designer, I would very much like them back. The selection of textures was slim enough already. I also would like to see a purple flat, the same shade as the VIOWALL wall texture, as then I would be able to create laser blocks in every colour of the rainbow. I can add it myself, of course, but it seems much nicer to work from srb2.srb's contents.