BYOB is important indeed and we also have Panther (see http://pantherprogramming.weebly.com/ and http://wiki.scratch.mit.edu/wiki/Panther_%28Scratch_Modifica...):

"... a host of new features such as file and webpage manipulation and advanced colour sensing, cloning and much more besides, Panther provides advanced usage for avid Scratchers around the globe as well as new programmers looking for a fluid, easy to understand starting language."