metabase support

I just want to make sure that I'm understanding what metabase supports. It does not support: - references - primary keys Does anyone find that this prevents you from using metabase? Or do you find that you have to hack your way around these deficiencies? I use MySQL most of the time, so I've learned to design without explicit references, but I'd like to have the opportunity to at least specify references in the schema definition (which MySQL allows but doesn't do anything with). It seems that with a DBMS-independent abstraction layer like metabase something like this should be supported. Any thoughts? Dean Hall.