What is the difference between firing weapon classes?

Our intentions are as follows: Orks should be (generally) running and gunning all the time so they will have the smallest difference in accuracy between shoot, move & aim (although they’ll also have the worst accuracy overall). Space Marines are meant to be the ultimate flexible warriors (and Chaos are similar), so they’re placed in the middle and should be fairly accurate while moving around, but significantly better while aiming.

Eldar are at the extreme, where our intent is to have them have the biggest difference between hip and ADS fire. The vision here is to make a well-played Eldar look like they’re always in control, running forward, stopping to fire, killing their target and running off to their next goal.