Yes I know of TPack and the simple cuboid, but I had one that could replace blocks of a certain type AND fill areas... the creator seems to have stopped making that plugin though and it no longer works. It was very handy, and I was always using it to save time in creative. There was a spot in the file to change what tool was used for it. The commands should be simple and quick to use, but easy to remember... I would list them from the old plugin but I have forgotten them... I am attempting to attach the old plugin in in text format in case it comes in handy. (just change the .txt to .jar) I would do this myself, but I know nothing about making programs or code and whatnot ._. Im sure this plugin would become popular, seeing on how its so useful in large projects ^.^