Not sure if you noticed it, but there's a tooltype for specifying wad files used. At 1st I tried renaming them as well to get TC's and mods, etc. working, but then I noticed the tooltype option.
That Suspended In Dusk mod looks pretty decent for "normal" Doom, but am I alone in thinking it looks a bit like Breathless? Not a drastic difference between Doom and Breathless in looks at the best of times, but that screenshot looks pretty Breathless-ish to me.