There are currently no plans to implement this. GoToWebinar already allows you to run both registration and attendee reports in order to gather attendee's email addresses, which can then be used to send direct follow up email.
I suspect attendees would need to agree to supply this information each and every time they register before we would be able to provide it. It would certainly raise some privacy questions.
Hi, Is there any update on the IP address sharing as it would be very useful to send custom followups to attendees.