Physical Inventory

Hi Gurus ,

I am new to SAP MM & seeking answer for few basic question  .

As I know  we can set physical posting tolerance limit in OMJ2 . I have below 2 questions  .

1. If we don't maintain any user id  in OMJ2  then that particular user doesn't have any restriction & he can post any values in physical inventory . Please let me know if my understanding is correct .

2. Can we also set the physical inventory  tolerance values  for  any particular transaction like MI04 or MI10  for a particular user  .

Do we have any provision to restrict the user at  user master profile (SU01)  also  .

Thanks,

Regards,

Aman