Idea for sandbox/new world??

[OPEmeraldKing]

I am thinking perhaps for a sandbox we have a survival no flying world with slimefun and no flying (unless with slime fun jetpacks) the reason I believe this is a good idea is that mw doesn't take use of all of slime fun. Its easy to progress and you can buy almost anything in mw. Spawners also don't work in it which wastes some of slime fun. This is why I think its a good idea. Also add suggestions if you like.