Currently I see Marketing Form - Landing Page form type contains a configured solution on Contact Mapping Rule, we can freely define mutiplie contact fields as composite key to find out the exact Contact.

However, the event registration form type only can use fixed contact mapping rule in event registration as below:

• Last Name + Email
• Email
• First Name + Last Name + Email
• Owning BU + Email

But in our case, those selection cannot fulfill the business requirement, all above mapping rule contain duplicated contact record.

Can MS enhance this setting?