Quick Fill is a feature I was very excited for but it's lacking. First of all, I think it is bugged right now. Every worker I create has all the skills set to 0. I doubt it is intentional.
Other thing is, I would like to make the workers I create for a specific country but I can only choose a specific larger region. I don't really want 15 more European workers, I just want 15 more Finnish (or even Scandinavian) workers so I can have all native workers.