It would be great to be able to add a merge field in the subject line of C&P Autoresponder emails. You can add merge fields in the email body itself through the C&P Designer template, but the subject line is set in C&P Autoresponder in C&P Settings and doesn't seem to give you an option to add a merge field. This would be helpful to make emails more personal. We'd probably want to add custom fields from the Primary Campaign Source on the opportunity, but it would be helpful to also be able to reference the C&P Transaction or the Contact data.