Alas, we are not shrews!
Shrews are among the smallest mammals of all (with the possible exception of the freakish bumblebee bat) and have incredibly rapid metabolisms. We would explode if we ate as much as they need to, to keep their little engines running and I'm afraid extrapolating upwards to humans will not help us avoid the state of inebriation.
I'd be more interested if they could genetically give us that molecule which acts as anti-freeze in blood that is carried by some animals in the antarctic. At least then you could stumble back from the pub in deepest darkest winter and not care where you fell asleep on the way home.
*The vulture because it might not be dead, it might just be very, very drunk.