Manager database is not stored in normalized relational database. The way I see it now is that custom reports are the way to go - the interface is available in all languages and it’s more intuitive (visual) than plain SQL.
I recognize custom reports are nowhere near its full potential. There is new version of custom reports I’m working on which should be exposing all the data Manager has.
The best way to get what you need is to outline what specific report you need Manager to be able to generate. I can tell you whether new version of custom reports will be capable of generating such a report. I’m confident it will.