A nice feature to have would be the ability for registrants to create an account and then create multiple sub-profiles for that account (an example would be a parent creating the account, then creating sub-profiles for each of their children).
Then, when the registrant is registering for an event, they could select one of these profiles as the person they would like to register for the event.
I also would like to see something like this. I plan on using DTRegister to create a specialized type of event registration. The site I'm designing is a site to register for team chess tournaments. I would like for the chess coach to be able to register his team on the site, enter all needed information for each player on the team, select an event, then be able to select from the team members (checkbox) those players who would be playing in that tournament.
The next tournament, I would like the coach to be able to select from the same list of players (already team members) by simply checking the check box.