Hope I'm not being pedantic here Ledsled, but the B767 manual states "A/P systems initiate a slip with a maximum bank angle of 2 degrees when the crab angle exceeds 5 degrees"
There is a considerable difference between two degrees and seven. Also, the autopilot will be completely stabilised on the G/P and localiser, on speed and spooled up when executing it.
The other problem with sideslipping a swept wing aircraft is of course that the apparent airflow to the leading wing is much greater than it is to the trailing wing. If you have enough slip at low airspeed, I would imagine you could find yourself with an unexpected wingdrop.
Any expert comments on this?