In my mind dealing with blood is easy and I don't want it to be any easier, I always play with a friend and we raid 1 hospital and get as much as blood as we will ever need, I think regen and applying a blood bag to your self would be a really bad idea and would make it be easy to be a dirty bandit considering that they don't make friends, they could just camp till they run out of food and water instead of blood because it keeps going up. Basically they could camp forever if they keep taking food from there victims and won't have to worry about blood.