The max_bank entries in aircraft.cfg do not affect the banking function, btw. They are only used by the stock wing leveler. Sorry.
It limits the bank angle during turns when in HDG HOLD mode. And my solution to the problem was based on an invisible HDG HOLD mode.
AFAIK the automatic disconnect due to G max/min, stick movement or excessive bank angles will disengage all autopilot modes – although the system will still be energized unless the reason was a power failure.
Funny that SAAB never revised that. They must have known about the operations policy regarding DÄMPN as the standard mode…