It used to have that function, but I never was able to import any of my .blend files and that import isn't available anymore in the 2017.4.1 version that I'm using. Since I found out that there's also (still) a bug when refreshing COLLADA files that I export from blender, I currently use .obj or .fbx for SP which works flawless so far.
Yes, you have many options how to use and export maps from SP including custom "user" maps. An example:

BTW, a fact I wasn't aware before trying out SP which also left me up skeptical if it would be suitable for NL2 assets.














