Some off the cuff thoughts:
I don't have the FCOMs handy, but I think engine inop the aircraft will roll to 7deg AOB max without aileron input in normal law. Regardless of thrust setting? Hmm, if speed greater than the applicable Vmca then yes.
The ATT vs G discussion is interesting, but generally not relevent as flight/environmental conditions are normally more dynamic so corrections [ S/S inputs] are inevitable. As expected, the big engined [ie non CFM] aircraft appear more affected by thrust changes.
The turbulence response is a factor, one reason why Airbus suggest "global" sidestick inputs.
Can't say that I've thought it prudent to play with the sidestick at high altitude [330/340] but A/P disconnect does not appear to produce any pitch up tendency.
Overall, Airbus FBW is generally a delight to fly. The Pilot just needs to remember that the aircraft still obeys the physical laws of Aerodynamics and Gravity should he get it wrong!