I see that the rapid fire skill is very erased, the skill running shot is faster than it is and more useful, so I suggest a skill that works in conjunction with the running shot or other classes if the person chooses to take the maximum C2 from class.
Change the Rapid fire skill by a buff skill that enables you to shoot with both hands for x time.
A passive in C2 that enables the use of 2 cross bows.
Thank you and sorry for my English =]