Central Database Class with all students.

I have lots of students and different classes. Some students take courses in different classes. So for example I have to change their e-mail address, I have to change this at least two times. If I could work with a 'central database' with students and then 'link' them to a 'class' than I would only have to change his or her e-mail address once.
Could this be possible in a future release of this wonderful app )

Hi Roel,
We've got this in our roadmap.
The current method of updating data for students in different classes is using the Tools / Students option on the top bar. Here you can select a group of students and copy it to a different class.
If the students are already in that class, their personal details, photo and notes will be updated.