What you have got to remember is that the ebike motors are used in different countries with different rules regarding top speed, power etc.I’ll have to look into it the guy at Evans was adamant that any interference with the motor side of things would void the warranty and the reason I bought new as opposed to used is the two years cover on the motor.
I don’t think de restricting should be an issue as the motors would have been designed to be used in many different country locations with different parameters.