Well truthfully, if I made a map where walls could fly and be used as a peon, what would be the point of something like that? It wouldnt result in a map I'd actually want to play. It would just result in a map that is, well, stupid. lol. My philosophy is this: Just because you can do it, doesnt always mean you should do it
Thats why I dont like most custom maps. They lack structure, they lack standards, they lack vision and purpose. I like all of those things. I dont really like chaos and anarchy. A catapult that can be upgraded to like, level 255 doesnt sound fun at all to me. All it does is scream HACK. If I had a pult like that, I'd feel like I am just playing with cheats on.