My suspicions were right, these effects are Things and must be added to your editor via configuration file. My goal is to have Doom Builder 2 fully functional and compatible with EDGE. It still uses old EDGE configs so once I get everything properly listed, I'll upload the files publicly.
Here is DOOM2 MAP02, Underhalls beautifully lit and a Green Key, too! I accidentally placed two in one sector, so one side may be brighter than the first shot.


DOOM E1M1's nuke catwalk, illuminated by the dangerous beauty of toxic waste.

DOOM2 MAP03. This time I used a sky glow thing I created, lighting the ceiling instead. With this, you can give your lights a dynamic aesthetic, similar to Doom 64


Before:

After:

Let me just express how awesome this port is (again), being highly customizable and easily reflecting the modder's style and personality! All tested in 2.0, may downgrade to test in 1.3 for compatibility. Wonder if this may work in Dream3dge?
Thanks, everyone!