Idk if its there in the instructions but you should write press C to pop up the pen menu. Im not even sure how to pop up the rest. But at least I cant make some patterns, I like it. Can I export?
Double click on the left side will create "+" icon, then you type the node name you want (from the description).
There's no export in this version yet, probably not too hard to implement, thanks for trying (and liking) my little tool.
*Edit : There is now, thanks for suggestion (I said not too hard but I end up using someone else extension, still.)*