So after some regular practice, I'm getting there. A metronome check tells me I'm going at about 110+ bpm with few mistakes.
So I was thinking of adding the 2nd shape, but a revisit of the lesson shows that you should know how to *use* the first before moving on. Stage 3 doesn't contain any lessons/songs that require penta picking, apart from the Edwyn Collins mini lick, which I've been doing.
Do later lessons/stages have penta shape 1 stuff? If not, not sure I should stay with it when I could use my time for something else. Sure it helps with picking and getting a feel for finding your strings, but if it doesn't get any actual use til way later, doesn't seem like it's worth being a regular in my routine.