Yes, I believe that is how it would have to be implemented if a minis category were to be seperated from the accessories category.
HOWEVER, please note that I am but an observer here, and have never seen the rules and agreements with GenCon, I'm just the guy who brainstorms stuff with Dextra, the business manager this year.
Basically, however, the way *I* see it from our conversations, Ghostwind and Fracisca are right on the money for what we've been talking about. The ENnies -cannot- judge minis games, wargames, etc... so everything has to be directly RPG-related to be open for judging.
For example, minis from Games Workshop would not be eligible because they are for mini wargames, even though there are also RPG product lines they work with (such as the Warhamster FRP).
That said, if there were to be an additional category for minis, IMO it would have to be ONE category, not a whole set of them. The list above would increase the number of awards at the ENnies to almost twice as many as there currently are... from 18 awards to 32. At that point, it would go from the ENnie RPG Awards to the ENnie Miniature Awards.