One more MP bug I forgot to mention...
In Single Player the Bowcastor has a "charge up" meter (a green bar that shows you how much power the shot has been charged for). In MP this graphical feature is missing.
But you can tell they probably intended to include it when you view spectator mode and then go to first person on somebody holding the Bowcastor (behindview 0) they have 99 ammo and a full charging bar!
So that should also be fixed. It helps to know how charged your shots are, it would make the weapon a little more useful in combat.