In order to save time it would be great to either specify a number of possible DBMS like --dbms=postgres,Oracle or maybe to exclude certain DBS like --dbms='!postgres' or --dbms='!postgres,!Oracle' (or with sth like --notdbms=postgres,Oracle).

At least from my experience often I either know the architecture but don't have a clue in which DB which parameter ends up. In other cases I know that for sure it is not IBM DB2, Informix, Microsoft Access, MSSQL etc.