Yes, this is really needed. The current 'email registrants' is too basic and needs to be set up every time you send out an email, i.e. you can't save a well formatted email to send out as a reminder for every event.
In version 2.7.18 (Joomla 2.5 version), we added a robust auto email reminder and follow up feature!! Existing users are going to love this. Setup a cron job to trigger the emails. You create as many reminder emails as you need. Set the number of days prior to an event for the email to be triggered. This can also be a negative number so the email can be sent AFTER the event as a follow up! Nice, huh? Further, these emails will apply to all events unless you specify the email for a specific event. Even further, you can upload attachments to each of these emails.
I upgraded to the latest DT version, was excited to utilize the email reminder feature. I can't find it anywhere to config. Is it covered in a video or some other documentation?