I make event registrations quite a bit for camps, retreats, day events, etc. After I get into the event registration and make way down to the 'Allow registrants to join my contact list', it's quite often that I have forgotten to make an email list. It's easy to just come back to it later and select this list after I create it, but it would be so much easier for me to have the option to create a new email list at that moment, inside of the event registation. There have been a handful of times I've forgotten to go back and change it and then people are upset that they can't register because the system is showing they have already registered because I used an old event as a placeholder.