Add temporary email domains to the default consumer email domain blocking list for form validation

Would love to see Marketo add temporary email domains (e.g., mailinator.com) to the consumer email domain blocking list for form validation. 

OR, alternatively, allow users to add more domains to block for their own instance. Currently you're not able to add to the existing consumer email domain blocking list, nor are you able to create an additional rule to block additional domains because the system does not allow two validation rules that reference the same field.