Overall performance issues and glitches addressed. This is top priority. I want this DLC to work when I'm finally allowed to play it.
As for minor gameplay changes:
1. Let Vampires use the Face altering person, or give them a vampiric equivalent in Castle Volkihar. Also, allow vampires to select various types of eyes, including the old eyes they used to have.
2. Have the dog companions respawn if killed (maybe give the player the option to name them so they can be "new" companions)
3. Address the frequency of vampiric attacks on towns (they don't have to be removed, just toned down)
4. Enhance Dragon AI/Behaviors for all dragons so that they can dive under water if it's nearby and deep enough.
5. While I feel the transformation time is fine, let us move a little while doing it. It'd be great sprinting to someone while transforming, so that you're in full form when you attack.
6. Add a "Favorite Ensemble" option, so that you can reequip all of your equipment with one button. The less clicks the better.
7. Increase the marriage options available.
8. Last, and definitely not least: Either allow Aela to make you a werewolf an infinite amount of times, or allow the random encounter werewolves the ability to pass their affliction onto you. With the later, please, please, please include forced transformations when the moon(s) is(are) full.