Boil the pasta according to the package directions. While it's cooking, blend together everything but the noodles and the nuts in a large bowl.
Drain and rinse the pasta, then pour the pasta in to the large bowl with the peanut butter mixture, and mix well.
Top with chopped peanuts and any optional toppings (I don't think I'd ever make this without the additional scallions and cuke – yum!) Best enjoyed at room temperature, though you can do it cold, too.