A "How-To" is always a good idea. But I think, there is no need to add pictures. A how-to with pictures remainds me of computer magzines for Windows users (Computer Bild) where you are told, which button to click in the next pop-up window.
I expect rather skilled users, that would be satisfied with a classical written man page explaining the options. For my case, when I use a new program or gui for the first time, I very early explore the "options" or "settings" menue to find out, what I can customize in which way.
Another thing is, that there can never be to many options, provided that all of them are preset to reasonable default values and thus making the whole thing useable with no prior configuration. And this is definitely the case with Sunflower.