The idea of using shaders to make larger flat areas look nicer is definitely appealing. I'll look into it once the bsp itself is finished. I've thrown some new stuff into the map, and I have some debug-lightmapped screenshots to prove it:

The new wall in action:


From the control room window...


...and from the land bridge. I personally love this pic.


New teleporter labels, matching Bungie's death island banshee and turret icons:


And the new control room banshee pit, which actually lives up to its name now. Don't fall.


And thus progress.