Ability to run selected section of the block diagram without having to run the entire VI. This would be a useful debugging feature.
Right now I have to select the portion I'm interested in, and create a new VI out of it (or a subVI, with the drawback that I can't easily undo the changes to the original VI)
Would be nice to just be able to select a section of the block diagram of interest, interactively initialize the inputs or optionally use the default values, and run it.