I think a faster heart beat would be more interesting. Plus, the faster heart beat would mean that they would need more blood thus the vampire part coming in. What would you think of them being able to change into wolves like a normal werewolves but would keep the vampire eyes and the vampire teeth just thicker? So even in wolf form, they could take blood. The harder part would be mashing the instincts of a vampire with a werewolf. 

I agree! I think I am going to leave the bond thing alone for now. Though I think meshing them into hybrids could be really fun and would fit in well with what I have planned with the Marrok. ^.^

I'm glad you are starting to feel better :)