Confirmation-E-Mail [message]

Hi,
a german judge decided, that it is necessary to send a confirmation-mail with the [message] the author (sender) wrote included. I know that the developer of this plugin baned that tag for security reasons. In germany it is a special case now. So is it possible to allow the [message] tag in the “confirmation email message” section of the FS Contact Form?

Best regards,
Mathias

https://wordpress.org/plugins/si-contact-form/