Here is a quick video I made showing off what WorldEdit commands Constructors get on the Creative server. If you have any questions just ask. Another way to get around the duplicate messages thing is, instead of alternating between //set and //replace, just do //set itemname and then //set datavalue, its two different commands but they would do the same thing, you would just have to update your positions accordingly
The duplicating messages got me trying to mess with WE, haha, I think WE is good to have even if it only goes to 100 blocks being taken away or placing them down.