I have a couple cookbooks from Urvashi Pitre (see TwoSleevers website). She has a crib sheet for doing rice in the IP which always uses the pot-in-pot method. For black/wild rice she uses 1 cup rice : 1.5 cups water with 0.5 cups water added after pressure cooking 22 minutes on high, with a 10 minute slow release. She also adds 0.5 tsp salt and 1 Tablespoon fat.
I've never done Quinoa in the IP.