Topic: Adding Comments to Graph Functions
It would be nice to be able to add comments to custom functions (a third column) and in each graph function definition, in addition to the legend description, primarily for documentation purposes. For the latter, I suggest adding an option checkbox "show function comments" so that the comment would display like a tooltip when the mouse pointer is over the function. Additionally, the function definition right click menu could include "Insert comment" that would open the insert label box and put the comment text in there.