How did I miss this thread?
Make a movie with zombies that are just as intelligent and agile as normal people.
You mean like the film zombies anonymous, 2006, Directed by Marc Fratto
Or the other option is making a zombie porno.
and again been done Porn Of The Dead, 2006, writer/director Rob Rotten.
I AM THE ZOMBIE KING! LOL.
Most things, if not all have been done.
The best thing I think would be to make people relate to the characters make them the average family man/woman who's hard working and want's what is best for the family.
Then focus more on the decisions they would have to make to keep their family safe, what if someone had a bite, would you kill your partner to save your kids? or one of your children to save your family?
when the food is running out and its not yet safe to leave your home would you be able to kill and eat the family cat or dog.
As for zombie development you could please both sets of fans the people who like the "super" zombie and the people who like the "classic" zombie.
When you first die rigor mortis has not yet had time to set in so the "fresh" zombies would be fast and fairly agile but as the hours/days past they would get slower, you could say that the virus slow's the time it take for rigor mortis sets in but it must set in the dead won't stay fresh.
I'll get back to you with more ideas soon, as the hours getting late and I've had a few beers.