I wanted to pass a long two features that I wished existed.
I think it would be nice if every block in GRC came with a comment field. A field for text that does nothing but allow users to add notes to help others understand they're thinking when they set-up the parameters of the block. It could be thought of as a user definable documentation section.
The second was a 'comment through' option. This comments out the block and passes data through it to the next block. Saves having to mess with wires between blocks that are commented out.