Storminator said:The odds of the double shot working are so low, it almost always fails. Allow your players to use double-shot at will. Then only give them one attack roll, as the second arrow flies off in a random direction.
There's just that one, rare, time when it actually works as intended.
PS
Its a bit narrativist to have the character decide after-the-fact that "this was the shot of the day that came closest to working!". But as a moderate simulationist I kinda like it.