After I drew the original plans, Dan Banjock and I used to fly 2 up. We had a blast. A few years ago Joe Gilbert, Marvin Denny and I flew 3 up. Lot's of fun.
As to neat maneuvers:
A slow slow wing over. Start with the wind to you back and climb. You can also do this and reverse at the top and come back down to whatever else you want to do. I have also done the letters of the alphabet. Also, back down in a hover, land on the tail flipping back to the landing gear and the take off again. This is rough on the elevator, but is fun. I've done that in demos. I have done a whole flight without ever completing a lap. How about vertical eights with the tops at 45 degrees?
If you can think something up, you can do it.
John Bender's "House" sounds interesting. This could also be used in a freestyle stunt event.
Since I published the Slob in FM, it has become an international disease!