Feature Request: Option to hide Email Address for additional guests

[stantond]

Feature request for RSVP Lite.

When replying for a number of guests on the same invitation/from the same household, there isn't any need to collect all of the email addresses - just the primary guest is enough, especially for a family with children.

It would be good to have the option to only show the email address field for the primary guest, and not for any additional guests shown in the same form.