I will add your feedback to the feature requests, but be aware that this is not a trivial change. The problem is that when you are reading files you actually want to skip the comments, so you are asking to change the behaviour of the GRAQL shell depending on contexts which are not clear cut. For this reason, although it might happen in the future, I cannot give you a definite timeline.
In the meanwhile, I suggest you use a text editor with columnar selections. I personally use (and many in the team do) Sublime 3. We are also developing a syntax highlighter for it, so it will definitely make your life easier.