@ itsBao93
Those would be good ideas, but a level editor would be way too hard to use, unless you on an iPad. The smaller screened devices that the majority seem to have wouldn't be able to do it all that well. It would take far too long to just scroll do the other side. I can't see it happening.
For your other ideas... Again, no, if they require a level editor. However, I think it would be possible to add upgrade packs to your Guild House, though I'm not sure about specifics. Upgrade packs for, as you said, soccer fields, or maybe ice rinks. Perhaps commands for inside the guild house to warp to them, so the house doesn't need to change each time.