Based on some entry in german osm forum, I got my josm to latest built and did a refinement of my 3d buildings. The key Q in josm is very nice. I learned, again. Was a nice big changeset - http://www.openstreetmap.org/browse/changeset/14275474 But as I was in the run, I just did refined the NMS St.Peter in the Brucknerstrasse and added 3d Tags. Trees still missing and some more. http://osm.org/go/0Iz__M1mI--
Lets see how my mood keeps up the next days. Got some nice ideas. And lots of areas to improve and fill in Graz.