I have seen, that via Data management > connectivity > driver definitions it is possible to define a connection to your database, but I found no place where one can use this connection (no repository connector, no information unit). Are this just there as infrastructure for someone who wants to implement a new repository connector or information unit to be able to use this connection, e.g. to define a new information unit that aggregates the result of a SQL query?
This page is only if you want to add additional datasources to your report, that are connecting with so called "Connection templates" of DTP. Remus uses a plain ODA Driver, there is no Connection profile required.