I agree with that as long as the moderator is limited to three words:
Economy / Trump (Hillary to follow obviously)
Defense / Hillery (Trump to follow obviously)
Illegal Immigration / Trump
Guantanamo Bay / Hillary
Closing statment: Trump
Closing statemen: Hillary
Nothing else should be said. Let the nominees go at it.
Any communication with one of the nominees, would be immediate expulsion for the moderator