I tried using these commands while I had my world edit voting time, and I dont have permission to use it. I now understand that that is not an allowed command for players to use since it can cause lag. Understandable. Since //sphere is allowed and it is a 10 block radius limit, //copy should have a limit in it too... It is a very helpful command and would be greatly appreciated if we could use it.
No copy and paste is indeed allowed its just that only ranks Elite+ can use it, sorry. Hop you get why now. And yes //copy has a 5000 block limit, along with all other world edit edits.
If you wish to bypass the limit, if you have access to the command "//limit <val>" then you can change what it is set to. Interesting that it's 5000, as this is the value I always recommend people set on themselves before doing any worldedit commands