Automatic notification would be a neat feature.
Have it text a family member when a seizure is detected so they can follow up with a phone call in a little bit to make sure everything is ok.
As more and more 911 centers accept SMS messages, it might be cool to allow the user to specify some threshold after which an automated text is sent to 911. The vast majority of epilepsy related seizures do not require an ambulance, but in the event of a seizure that does not stop in a 'normal' time frame[1], it could get help coming that much faster.