LM5050-1: Design questions for LM5050-1

Hi team,

 Please help to answer below questions. It is an urgent case.

1. When the customer design with LM5050-1, whether they can add resistor between pin5 and mosfet gate?
2. When the customer design with LM5050-1, whether they can add R215?
3. If no, please tell me the reason. If yes, how to select the two resistors value?

Thanks very much!

 Best Regards,

Sophia Yao