Can you explain more what you mean by PWM? e.g. frequency range, is this for motor control or signalling or other purposes? Do you need edge aligned or centre aligned?
Do you have a plan for update the Simulink Library for PWM? I think that PWM frequency could be edited in a text box. or if the limitation is need, the value could be between 10Khz ~ 10hz which is for both DC motor speed control and servo motor control. Also, PWM signal is left-edge aligned