Ever since hcbat we here on flower have been dreaming about possibility of
mixing backgrounds. Making it happen like it is done in hc prolly would give
us bit of issues in player powers.
But maybe joining to a guild in another background when one is forced to take
12-15 levels of the background basic training would balance this a bit. Yet
another background would cost 12-15 levels extra again.
And if that wouldn't be enough, 2nd background training costs could be
doubled, 3rd tripled etc!