Our group is using the rule "a ranged attack from, or into, and engaged tile with a friendly force suffers a -10 penalty to RS." and "A ranged attack through any engaged tile is -2 per tile". The second may seem strange, but if you are targeting something in particular far away, and there are things you want to avoid, you can maneuver and change position to avoid hitting those things (even if they are 2 enemies fighting). However, if you are firing from an engaged tile, a -10 is merited because a predator or alien on your square is going to put your shooter under some serious duress. And firing into a tile with a friendly where dynamic close combat is happening will require a surgical shot.
On the second point: we have been playing where marines and predators CAN do close combat AND ranged skill during a turn. They are separate action types. However, that shot is at -10 (because you are firing from an engaged tile), so its practically garbage. This is why paroxism is so good, it gets multiple weapon attacks in close combat at a high skill value. I hope I am right on that one. That warrants an example in the rulebook on the right way to play because it is so hard to understand what the rules intend.
Anyone else have FAQ that
Anyone else have FAQ that they suggest making it into an AvP rules update?