This project has really come a long way. I downloaded the latest files for Austria from simheaven and along with skymaxx and a freeware lowi on the org, this is what I got: Keep up the great work guys, you're honestly bringing this sim to a whole new level.
Continuing the European tour. Flying over the Bremen scenery from simheaven. World2Xplane enhanced scenery. The aircraft used is the Alabeo Piper Tomahawk II.
Not to the level seen in screenshots, no. Atmospheric scattering takes some special rendering tricks to achieve, and thus is only available with HDR. The next best thing for you would be limited to sky colors that trick the eye, or even some kind of a plugin not currently available to alter things on the horizon.