In the simulator, the max roll angle is bounded (hard coded, sw/simulator/flightModel:149) to 0.7 rad.
Ok, I changed the sim to take ROLL_MAX_SETPOINT instead of the hardcoded 40degrees.
For the nav radius, I can set it to any value while flying the STANDBY block of basic FP. For the survey, the radius is statically set by the grid attribute. The radius of the circles will be half of it (so grid="50" for a 25m radius turn). If you use a variable to change it dynamically, you will have to go out of the survey block and enter again.