Wow, those look pretty cool! I actually just started playing around with the 3D layer a couple of days ago, to see if I could make a brush for market tents (jugabyte's thread on the topic here). I didn't get too far but the things you've made here look great! So in answer to your question I guess, no, I haven't used those features, but I'm going to try them out soon!

cheers,
Meshon