First, I'll say I'm not a developer and do not have a full understanding of
this problem.
> Should the autopilot be a separate process that just basically inputs
pilot commands?
> IE. turn at the same physical rate possible?
I believe the autopilot is another subsystem, and most (I'm not 100% sure
about all) autopilots simply control the elevator/trim, ailerons, and
throttle. Although they can seem to have a higher control effect than
possible off of autopilot, it actually is only putting in the same input as
a pilot could.
There are several ways to fix this, from realistic to unrealistic, but a
basic (probably the simplest, too) way to fix a high roll rate would simply
be to limit aileron action, as Curtis Olson has already said. You just find
the autopilot's XML file (such as 787-autopilot.xml) and then look through
it. At the bottom of each PID loop, there is usually something like <u_min>
or <min> (I can't recall correctly) which specifies the maximum command. You
can limit this, thus limiting the autopilot's control effort.
There's other ways, such as re-programming it to run through a roll rate
command, but that should be the simplest solution.
This is all from my (rather limited) knowledge, and I may be
misunderstanding your problem.
I hope this helps.
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