Nope, starcraft isn't under units, it's got it's own category with no "Units - "prefix. So adding a gnomes category wouldn't be linear to how it used to be wherever you put it. Starcraft was added just because there were so many models out, AND it's a game, gnomes are just a race of a game. So if your gnomes don't fit just put them under misc, that's what that category's for.