Modifyworld is not the situation that is causing this. The reason you can't do any of this is because the plugin "EssentialsAntiBuild" is in. I have owned a server with only ModifyWorld and it didn't do any of those things. I'm planning on asking if we can take out EssentialsAntiBuild and EssentialsProtect as they aren't needed at all. WorldGuard is the only one that we need and the reason why ModifyWorld needs to stay in that it lets you talk in chat.