I have often thought of changing the brake system by adding differential brakes. See the line at the bottom.

[brakes]
parking_brake = 1         //Parking brake available
toe_brakes_scale = 0.99  //Brake scalar
auto_brakes = 4
hydraulic_system_scalar = 1  //On brakes dependant on the hydraulic system, ratio hyd system to max brake hyd pressure
differential_braking_scale = 1

They can help quite a lot with turning. Like they do on the 707.