There is a lot of thought among kayakers what particular points of contact a important for total control of the boat.  Knee and inner thigh braces seem the most discussed as critical.  Eric Sprenne considered it and came up with a pretty adept configuration:

> Wish I could provide some fantastically brilliant suggestions, but I'd offer  two basic points to emphasize: > 1. Well-fitting thigh braces. I took my time carving out form-fitting > thigh braces that make paddling, and especially bracing/rolling/ and even  turning the boat *so* much easier.