Hello, I am wondering about the reasons for the difference between the autopilot in the 777 compared to the 737 and other Boeing models. When I fly the 737 ngx and I am, say, practicing t&g's I like to partially delegate to the autopilot things like the throttle and even the pitch so that I only have to manage turns at the cruise portions of the exercise, however I am finding that I cannot do this with the 777 since only the throttle is independent of the other autopilot controls so I can either have both the heading and pitch managed by the autopilot or not, and to me this is a little bit frustrating since I really enjoy having control of the heading without managing anything else. I find this somewhat odd too since it seems like a reasonable option to have implemented in such a modern airliner, so I wonder why this is so, why is the heading and pitch controls attached to one another in the 777 and not in the 737. I haven't really studied the manuals of this aircraft so I don't even know if there is an option to reconfigure the autopilot in the 777, which I really wish was the case but I haven't found anything so far.