It would be nice to have an option on the report book to Collate and set a Multi-Value Parameter or Data field as the list for collation. Essentially if i have 3 reports (A, B & C) and they have parameters of Start Date, End Date and Client(Multi-Value) and i want to collate by selected clients. The report book should then render the report as follows

Report A - Client 1
Report B - Client 1
Report C - Client 1
...
Report A - Client 2
Report B - Client 2
Report C - Client 2
...
Report A - Client 3
Report B - Client 3
Report C - Client 3

Collation is a very common scenario when working with multiple reports