The blog post is interesting. I've moved away from using KAF AP flour in my pie crusts. I think that I get better results with Gold Medal, or using some pastry flour. I wonder how the peanut butter crust would go with a chocolate pie filling or maybe a banana one.
The "Light-as-Air Lime Pie" in the KAF Whole Grain Baking Book (pp. 469-471) features lime juice in the crust as well as in the pie. I've not made it and only thought of it, as I've been combing through that cookbook lately and remember seeing it.
I have a recipe for a cornmeal pie crust that was featured, probably by the L.A. Times, with a pumpkin pie. I used that crust with a hamburger meat pie, but I haven't made it in years, since my husband is not fond of ground beef.