In the SBS models if it fits it is good to go as long as no W&B limits are exceeded. How people are built plays a major role in whether or not they will fit.
Not sure I would agree with this - large passengers usually have large thighs which may restrict stick movement. Full control deflection is kind of like a gun or life insurance - you aren't likely to need it, but if you do need it, you will need it very badly.
For large passengers, I therefore remove the pax control stick. I won't fly with restricted control movement.