Oh I don't know about that. When I was in the USMC back in the early 80's we used a bolt action rifle. So I can see where Rapid Shot would come in handy for that. But any way I sent an email to the rulesmasters asking about this Rapid Aim. I will post the reply when I get one.
Just got an email for the rulesmaster and this is what they say.
Having worked long and hard on the shooting ranges your character is able to aim at his targets extremely rapidly, greatly enhancing your accuracy.
Prerequisite Base Attack bonus +6
Benefit The character can aim with a ranged weapon as a standard action