You're forgetting some silent types, the Investors. There's always some guy at the convention who doesn't know anyone, but he's an Investor. They prefer to use big words to describe their plans.
Model manager/wrangler should be on there. Not neccessarily an agent from an actual modeling agency, though.
Under Designer you could get more specific: flash, scripts, blog themes, graphics/banners/logos, full sites, CMS designers/installers, etc