Recently I found my copy of the Storm of Chaos book and came across the old "Master of the Mists" Honor for High Elves, when it struck me that it could easily be adapted for Wood Elves.
For those who were unfamiliar with the rule, it allowed a single round of shooting after final deployment(including scouts) for both players that suffered no penalties for range, nor did it actually require the firing unit to have range or line of sight. The only caveat was that it was tied specifically to Sea Guard, Eagle Claw Bolt Throwers, and Sea Rangers(which used the Shadow Warrior profiles) and it could not be used to single out characters within a unit of like-sized models.
I am going to be playtesting it at some point soon for Wood Elves with some tweaking done to the rule to balance it out given the large volume of fire(especially nasty fire via the special arrows) that a Wood Elf army can put out.
Add the following to the "Woodland Ambush" special rule in the Wood Elf army book(meaning that this rule
cannot be used by armies within the Khaine army list).
Immediately following both players finishing deployment(including models with the Scouts special rule), a Wood Elf player is allowed a single round of shooting which does not require the firing unit to have range to the target using the following special rules:
Units of Deepwood Scouts and units of Waywatchers(and any attached Waystalkers) can fire at any enemy unit that they can see, even if the unit is out of the normal thirty inch range for Asrai Longbows.
Units of Glade Guard can fire at any enemy unit which they can draw line of sight to or that a unit of Waywatchers or Deepwood Scouts have line of sight to.
These shots cannot be used to target characters within units of like-sized models or characters which are not mounted on a Chariot, Monstrous Beast, or Monster.
These shots do not suffer the penalties for firing at long range or firing Multiple Shots, and shots fired from units of Waywatchers and Deepwood Scouts that can draw line of sight to a model will suffer penalties for shooting at soft or hard cover. Shots fired from units of Glade Guard will not suffer those penalties(as the Glade Guard are firing massed volleys of arrows into the air to come down on the targets, rather than firing directly at the enemy units).
Waywatchers and Waystalkers are considered to have fired using their "Fast Shot", meaning each model fires two shots rather than one.
Each unit that can participate in this shooting attack must choose a different target enemy unit, if they are able to.
Otherwise, the shooting attacks are treated as normal for the purposes of special rules granted by enchanted arrows on units of Glade Guard and Deepwood Scouts.
I realize that this is a LOT for people to read, but any feedback would be appreciated. This is version is just the early brainstorming and has not been playtested. Feel free to try it out yourself.