I think this is modeled correctly. Also note that X-Plane will enter a special "stopped" mode when the ground speed gets very low - this is due to problems with "friction creep" that X-Plane was suffering from. So whenever the ground speed gets very low, X-Plane acts as if the wheels are soldered to the ground, so you don´t weathervane and shimmy off the runway in wind, for example.
That being said, it is not recommended to help with brakes during turns in an airliners. The differential moment is not very strong, and you would need a lot of power to overcome the braking effort. This is something for an emergency, for example if your Captain is incapacitated (the FO does not have a tiller) and you have to get off the runway to where stairs can get attached, But I wouldn´t even try to enter a regular stand or gate with differential braking, only. The power needed is too dangerous for ground equipment.
Jan