Hi @,
As you are looking at level editor examples, I figured I’ll drop a few useful videos here for your reference 
UE4 Geo 2.0 demo (this vid shows the Geo 2.0 branch from Github)
Source 2 Hammer Editor overview - really cool tools shown here:
A few cool features from watching these videos:
-The bridge tool can be set to “curve” the bridge mesh and subdivide it (look at the Hammer 2 vid)
-There is a “Propagate Mode” in Geo 2.0 - a change to a specific SM propagates to all cloned SMs in the level. This could be super useful if you can implement it
-Buttons to Triangulate and Quadrangulate - This can (hopefully) be added easily by using the OpenSubDiv library already included in the Geo 2.0 branch
-Select mode “Any” in Geo 2.0 - This isn’t really necessary but it might make it efficient for some people