The main feature was a version of box selction. I already have a sort of 2d rectangular selection, but wanted a fully 3d version. So, I added options to the Trigger tab so you can create a Trigger, which is just an arbitrarily scaled, rotated & placed bounding box, then select all Triangles, Vertices, or Objects within the trigger's bounding box. This is very similar to how the decal system works as well.
I've already used the feature to help carve out a river in the new Tower level. The river really needs some foliage and some decals at the cliff edge. I plan on adding alpha-tested geometry support in the next few days.
This morning I added Materials to the Object Tab, so you can see all materials in use by the world geometry, how many triangles are using each material. Also, you can use this to select or de-select tris by which material they use.