I might have to make that a house rule; shooting past your own guy. Archers are usually guarded by melee troops so you should be able to volley over your guy. Because when using your archer, if you miss the guy, he is usually on you next turn unless you are the elf archer w/4 range. It would be nice to have an enemy engaged and you can keep thumping arrows at him. Makes the archers more valuable IMO.
Archers are already pretty valuable. Besides, the point of SW isn't to be a "realistic" skirmish game -- if realism was your goal, you'd need to pile on so many extra rules that you should just go with a different game instead.