Just to give some more details and explain my I think this would be an important feature...
The company I work for hosts a number of conferences for our clients each year, and each conference can have 50+ courses, and each attendee has to select which courses they attend. The way I setup my DTRegister is treating each course like a seperate event. It would be WAY easier to just select which courses you want and hit "OK" rather than have to register for each course individually.