though I'm not an Oracle representative, I have an opinion on your request I want to share with you.
Oracle Database has some features which by design won't allow easy embedding. Disabling those features isn't really easy and you wouldn't look at just some features less but at a software that behaves differently in wide areas. What would be the advantage to use it?
I don't think you have to use MS Access, though. There are small embeddable databases available, even from Oracle (Oracle Berkeley DB to name one). So why should Oracle re-invent the wheel by downgrading a full-featured database that long that it is embeddable when other projects started to support this by design already?