So, we could have one or more of the following possibilites:
1 - Allow blank username in server configuration. Whem emptied, the username would be filled while connecting at at server.
2 - User the owner rule of a database to connect to it.
(2a) Maybe a server configuration should exist to turn off this feature (2b) Allow to connect to a database using a different role (when the owner rule is not desired)
Well, 2b is what I suggested.
Whom should I talk to suggest those features in a future pgAdmin version ?