im using the sign up form in the admin dashboard to create a user, but I don't think its a good idea since I want to create a random password on the backend, and I want the admin to be able to select an option from a pre-populated list in the form (after looking , i don't think that i can do that by changing the formFields object , correct me if im wrong please) so is it better if I just create my own sign up form and use the sign up API in the backend or what? for the login part all is good