I agree. What we've thought about was to add definitions to the class setup where you can define the columns ( like today ) and rows. With default data. But you should be able to create different definitions. E.g. you could have different attributes for CD and DVD:
CD
----
Artist:
Year: Category:
DVD:
---
Actors:
Year: Format:
You could then select in the object edit, with e.g. a dropdown, which matrix type to use. If you will need the fields for CD or DVD.
