To be able to select a part of the code in the block diagram and have a tool to make that all a comment (in grey colour and with shadings or something) that is it would be there but completly inactive.
It would work like commenting a piece of code in any other programming language.
It would be useful because sometimes you don't want to actually delete that piece of code. You just want to run the rest of the code as if that part of the code was not there.
Obviously the respective wires would be affected and go into the commenting area.
