1. I think that as long as the lats get trained hard they get strong. If you can't do pullups, why would you think that rows would be more important? I don't train advanced powerlifters like Dave does, so my thoughts on this might not be terribly relevant, but I like rows, and I like chins, but I like chins better for novices.
2. I thought I addressed this question, actually. It's in the book. If you're feet are not put on straight, you have to compensate for the mal-alignment by adjusting your stance accordingly. The critical feature is the tibial/patellar/femoral relationship, not the feet per se.