Probably a mod to let you feed without vampire's seduction (with the animations for it added with the DLC) or make it a 24/7 power..not one that appears after one day of not feeding.
lol andrew, as soon as the PC community sees Serana and Valerica its the first thing they are gonna do. =P
There definitely needs to be more feeding options. It's so limited right now, and there's needs to be a reason to feed as well. That's why I like the Better Vampires mod, because it has an option to get rid of the stupid backwards feeding, and lets you feed to become more powerful.