Hey,
I just found out what the "Brush" function in SCMDraft is, you can open brush-palettes by going to Windows -> Brush Palette.
Then click on "Open File" to open a brush file, else you can select terrain-squares (extended terrain), enter a name in the small textbox and click on "add", after that you can paste the added tiles as often you want.
Well, I just made a twilight-palette.

All those extended terrain-things are included.
The .jpg format screwed up the quality :l

You could fix those ramps, there's better blends in twilight.

See my only work on Twilight, it has nearly the same blends, but better ().