In many of my forms I require just an email address. These conversions are synced with my Salesforce instance, which requires a last name and a company for lead creation. My workaround is to have LAST_NAME and NO_COMPANY as static values in their respective fields for these forms.
However, some of these folks will later convert on my forms that require more information. My problem is - I can't change the update logic to "Always Update" as these contacts often then go back to one of the shorter email-only forms, so any additional name and company information I had gathered will be lost.
Does anyone know a workaround for this? Is there a way to create custom rules along the lines of "Update if blank or LAST_NAME"? I poked around and could not find anything.