To summarize, you are unhappy with Delta because their award availability on Air France is poor, and you want to know if it is better through Continental, Northwest, Alaska Air, or other US carriers that offer AF redemptions and also operate online shopping portals?
Yes, I'm just curious how easy any award bookings are through CO or KLM. I've never gone through anyone but Delta. I'm happy with any airline that has bonus opportunities, can transfer AMEX MR points and I can book an AF business ticket for 90k.