Should there be some kind of progressive attack bonus for ranged combat, like there is for melee? I know it would be tough since the ranged animation doesn't have an attack sequence as melee, but maybe some thing like a progressive bonus for each shot at the same target, as long as you are standing still. Have it cap out at the maximum progressive bonus for your bab. Maybe SOTR would allow you to retain the progression, or a portion of it, while moving.
I know most people using ranged combat don't find hitting the target the problem, it's ROF and DPS, but anything that could give it a boost would be helpful.