Trait that allows a second favored class?

I'm planning a multi class character. Is there a trait that allows a second favored class bonus. I hate to give up these nifty bonuses in the second class.

Being a Half-Elf let's you have two favoured classes.

Humans get the Eclectic feat.

EDIT: I don't think that there is a trait to give you an extra favoured class, aside from the racial trait/feature of the half-elf.