Composite Key as ID

I run on
License Level: OPEN SOURCE
DreamFactory Version: 2.14.0
System Database: mysql

I worked through documentation and through the new guide, however I could not find a solution for how to use a multi column / composite primary key as ID to run a request on a record.

I found other topics in the Forum, which indicate that this should be possible, but I had no luck so far.

Is there a way to feature request this, if not already implemented.