There used to be a number of these in earlier versions of the Rulebook, but they were all phased out by the time 6.0 came out. A few were re-introduced during the 6.1 project, but did not make the cut for 7.0.
In the 5.0 rulebook, the last two remaining were:
- GM of Druids: One additional Pass Without Trace per game.
- GM of Scouts: 5 points of Druidic Magic which may be from any level.
The main reason they have been phased out is because they encourage people to want to be Guildmaster for the wrong reasons, namely personal abilities instead of helping out people wanting to try the class.