I'm not an engineer.
The turning performance of an aeroplane in level flight can be related to the rate of turning or "Roll rate".The radius of turn is reduced and the rate of turn is increased by INCREASING the LF
I normally think of turning as heading change or yaw and not roll. You can roll an airplane with no heading change and perform rolls with zero G load during the roll. Granted you won't finish at the same altitude you started at in most airplanes. Which is why I said there shouldn't be any increased G load during a faster roll. There is going to be some spanwise stress during a roll. The wingtip is being left behind during the roll with the outboard ailerons locked. The rolling force is created close to the fuselage which will put stress on the wing attach points. How much more is created during a faster roll I have no idea.