Another feature I've seen in other CSG editors which appears to be lacking in Leadwerks is the manipulation of single vertices on brushes.
For example, I could easily make a trapezoid out of a rectangular brush by pulling the upper vertices in towards the center of the brush. In Leadwerks, it seems that I can only accomplish this by using several brushes, skewing wedges and rectangles to get the desired result.
Obviously this is a lot more difficult than just pulling in the upper vertices of a rectangular brush, but it can also affect performance if not done correctly.
Thanks!