Well, I just had a talk with Peggy's super wonderful vet about flight feather growth and thought I would share the info in case it might be useful to some other pea person.
Peggy still has four primaries cut (P1, P2, P9, P10). The vet said this isn't great, but he would probably be OK with this as he could still get liftoff.
The problem is that his first 5 secondaries (S1-S5) are also still cut. These are the "landing gear," and since Peggy has a bad leg, she said it would be dangerous for him to try to land with these - she said at most 2 missing in this group is safe. Keeping in mind that these guys roost 40 to 50 feet up in a pine tree at night.
The vet said that he would not normally start the molt again, and get these feathers, until February.
The options to speed this process up are:
1. Pull the cut feathers. New feathers will grow in 4 weeks. However, the primaries are rooted in the bone so this is a job for a vet (not that I would have even considered doing it myself).
2. She said that if I simulate Spring in his pen, it might stimulate feather growth. That is: rain, which leads to green stuff growing, which leads to bugs, which make a pea think there's plenty of food so they can spare the protein energy needed for feather growth.
I just turned the sprinkler on in his pen and gave him a bunch of mealworms.