Go read the Full Attack Action again Artoomis. It gives you the option of stopping after the first attack and moving (basically changing to a standard attack action).Artoomis said:I don't think you'll find this clearly stated in the rules, but it's the only way you can do it because otherwise you'd have to retoractively apply bonuses/penalties after even knowing if you hit or not. Obviously that's a bit ludicrous, so Caliban is correct.
The Standard Action doesn't give you the option of changing it to a Full Attack Action after your attack.
Feats like Rapid Shot and TWF can only be used when taking the full action, and apply penalties to all your attacks. So the penalties would apply to your first attack, even if you choose not to make all the attacks available to you.