We're going to add support for more DBs (e.g. Postgres and MySql) in the next release, I did a lot of work on the underlying libraries to make that possible.

However, mapping the tables/field names is not planned. I think it's a can of worms that I don't want to open: How do you populate the fields you don't know about but are mandatory when creating a new user/group?

You could go the way of setting up a middleman service that listens to the binary queries to (e.g.) postgres and "tranlates" them by substituting the field names, but that seems complicated.