How big should the battles be?
Is it just coincidence, or are the Trek movies with the best space battles the most popular? The Wrath of Khan, The Undiscovered Country, and First Contact are generally the most popular, and they all had great battle scenes (unfortunately Nemesis isn't on this list). From what J.J. has said so far, this will be a "space adventure". TWOK was a battle throughout, and FC used one as a teaser. DS9 had the epic Dominion Wars.
How much should the fighting tie into the movie?
How big should the battles be? 2, 3, or fleets of ships?