We did much the same, if you were "shooting past" a friendly model and rolled a 1 to hit, you potentially struck the friendly model and proceeded with the wound roll, armor save and injury roll from there.
It occasionally got silly...you know...you miss the intended target while shooting past a friendly model, critically hit the friendly model, the critical result is a ricochet. I can think of one instance where this happened and the friendly model that was accidentally shot was knocked down from the critical hit--ricochet and the nearest model was the shooting model, who was taken out of action from his own crossbow bolt. After the game, the model lost an eye! His nickname from that point on was Ralphie, cause he "Shot his eye out"
Thanks for reminding me of that, Ralphie the Reiklander lives on in memory!
Ryan