In D:OS1 rank 5 and 6 leadership gave a fear immunity aura to everyone except the character with the trait. Unfortunately leadership was so incredibly strong that it almost was mandatory for every party to have a character with at least 3 to 4 points in that ability. To avoid changing the current leadership further there could perhaps be a talent that provides fear immunity in a relatively small area around the character.
Alternatively it could be made into a separate ability. I don't think locking fear immunity behind a racial skill (Encourage) is a good idea. Certain racial skills being better than others is definitely an issue, but I don't think that the abilities should be balanced around providing unique effects that cannot be obtained through other means.
Maybe Larian could create a similar ability that cancels fear and gives fear immunity for one or two turns alongside a small movement bonus. The ability could be called Inspire, Hearten, Motivate or something else.
