We really need some kind of Expression Manager language for reporting.

So we could create simple reports (based on single responses or on mean / median values of all responses) that can be fed into some kind of graph library so we can create custom reports for the clients.

This is becoming more and more important. Clients want dashboards and real time reporting, they can't (?) or don't want to wait for a full featured report anymore. They need the results as quick as possible (we can discuss if this is the best solution for them, but I see this more and more).