Alright, this is admilittedly very, very minor, but in case you're a Skaven/Sisters player who has been pining to get Quick Shot back with your slings, here is a house rule suggestion:
Sling's Fire twice at half range:
A slinger receives one extra shot in the shooting phase if he does not move in the movement phase and his target is within half range. If the model fires twice then each shot is at -1 to hit.
Skill Quick Shot:
The warrior receives one extra shot during the shooting phase with a sling, bow, or crossbow. All shots taken with a sling do not suffer the -1 hit from Fire twice at half range
So a slinger with Quick Shot firing twice at half range receives a total of 3 shots with no penalty due to multiple shots.
This idea came as a result of the discussion in thread http://boringmordheimforum.forumieren.com/rules-and-gameplay-f1/dwarf-slayer-frenzy-ferocious-charge-t2360.htm