Well on my joystick I have 6 buttons, a hat, throttle and rudder. For the buttons, I have toggle zoom, enemy selection, shoot primary gun, shoot secondary gun, shoot all gun, and a look up button. Hat for all views. Rudder/throttle I use on the joystick.
Keyboard I used for everything else. Flaps, trim, radio etc. I found it tuff in a turnfight where I have keep moving my left hand from throttle back to keyboard for flaps. I would get lazy and not work on my flaps often and let it automatically retract rather then manually retract it to regain some E. I think if I could get use to Rudder Pedal and a real throttle I'd be a lot more effective in the game. There are a lot of manuevers that I just can't perform because of the rudder being is on the joystick.