Good list. Here's my own in no particular order as well:
Laptops
Seasons\Weather
University
A way for human Sims to move more quickly, but not as fast as Vampires ( Skateboards, bikes, etc )
Fear emotion
An attraction system\Chemistry
Darkwave radio station ( My favorite stations in the Sims 3 were the RnB station and Darkwave )
Wizards\Witches
Werewolves
More vacation spots
Ability to choose Vampire teeth for non-Vampire Sims
More random events ( burglars for example )
A gossip/reputation system ( Cheating is way too easy in this game. There needs to be something to make it more difficult. Especially since the Sims live in the age of high-speed internet and cellphone cameras. )
A way to get rid of ghosts
More ways to personalize your Sim ( likes\dislikes for example )
Ability to swim in natural water formations
More romantic interactions ( such as a proper cuddling animation )
More dances, especially for couples
Bonehilda, just because she was quite amusing in the Sims 3
Ability to lay down and relax in a bed
More instruments ( as a fan of the electric guitar, the apparent lack of it in the game makes me confused )