Racial traits centerfocused around specific classes would be a problem. Unique traits for each race would be nice, but gotta keep it balanced so that each race doesn't end up favoring one class over another. Of course can't have racial traits copy/pasted from one race to another or it's not really "Racial" or even "Clan".
Oh, an idea I thought about related to your idea Lienn was a +% bonus to HP or MP, maybe both, from physical level instead of traits. Such as a PL50 character can get +50% HP and MP or +50% divided between the two as the player chooses.