I have found a way of putting in single-line positionable comments.
Just drop a variable onto the screeen and save the file.
Edit the .crm file to edit the name of the positioned variable.
You can inclide spaces, punctuation, numbers, but not control characters.
save the .crm file in the text editor, reload in the crumble editor and your comments can be positioned where you like.
See attachment below.
Not suitable for students however!