If it does this, something's wrong. It's not a difficult control task.

I don't doubt it - but every installation I've seen does it. I know
full well it's not a difficult control task, but I also know it's not
the same control task for all airplanes. The more roll stability the
plane has, the easier the task.

A friend of mine who flew 727's for a while says that the autopilots on
those were the same way - they never used nav track enroute because
twiddling the heading bug (or even the roll trim) worked better.

Michael