Wow... I am speechless. I've never been that good at level design, but I enjoy playing around with editors nonetheless. It looks like I'll be using the DoF editor more than the actual game!
I'm curious about the "invisible walls". Can you set them to let certain objects through (or stop them)? Arrows for example? I love the concept of a bridge-making tool. There's probably gonna be some pretty whacky things coming from scenario designers with this. Perhaps an entire level made up of fallen trees.
I had a look at the "barrel" showcase, and gee am I amazed. So inventive yet such a simple concept

. But I am curious as to the system demands of this. Does the "barrel bridge" increase the chance of lag substantially? I would imagine so if you made an entire area out of such small objects.
Again, fantastic showcase. I so wish I could have a play around with the editor right now.