I agree with all that has been said above......
Also I sometimes find tht i can shoot at an nme during ACM(knowing tht i am way off with my aim and will never hit him) just so that he makes either a more tighter manoever or bleeds his E quicker or just does something stupid, (u will be surprised with what I have been able to do, from discouraging temp HOs to making ponies turn

) however i think that tracers off is better because it dramatically improves gunnery.
Just a question about tracers though, in real world they replaced bullets at regular intervals in the gun belt with special "tracer" ammunition, right? Did this tracer ammunition, on hitting target do any damage? Also if not is tht modelled in AH?