Are you saying can you combine melee attacks with thrown attacks?
- Gauss
If you are swinging your throwing hammer like a melee weapon, then your Rapid Shot feat is inapplicable; you cannot get an extra melee attack with it.
Nothing in the Full-Attack action says they must all be melee or must all be ranged, so I have always understood that to mean that you could mix melee and ranged attacks as part of one Full-Attack.
However, Rapid Shot says "When making a full attack with a ranged weapon". I can easily see many GMs would read that to mean that your entire Full-Attack must use the ranged weapon. Others might not - it could be read to mean "When making a full attack that includes making at least one ranged attack with a ranged weapon". I think this could go either way, so check with your GM to see how he interprets it.
Even if your GM chooses the more generous interpretation to allow you to use rapid shot mixed with melee attacks, you MUST apply the -2 attack penalty to every attack you make this round, even the melee attacks. Which means it would be impossible to decide to use Rapid Shot in the middle of attacking after you have already rolled any melee or ranged attacks without the penalty. For example, if you are standing next to an orc and you begin pounding him with your hammer (without taking a Rapid Shot penalty), and your first attack kills him, then you cannot decide to use Rapid Shot to throw two hammers at another orc because you have already made an attack without the penalty.
Then try this:
Rapid Shot says:
You can make an additional ranged attack.
Prerequisites: Dex 13, Point-Blank Shot.
Benefit: When making a full-attack action with a ranged weapon, you can fire one additional time this round. All of your attack rolls take a –2 penalty when using Rapid Shot.
So the feat explicitly says it gives "an additional ranged attack" and it says you may "fire one additional time" (melee weapons are swung or thrust; only ranged weapons are "fired").
So your bonus attack must be ranged. That much is clear. It's also clear that you must use a ranged weapon for your Full Attack, but it's not clear if it must be used for your entire full attack or only part of it. As I said, a lenient GM might even allow you to hit someone with a sword then drop it and quickdraw a throwing hammer and then, because it is part of your Full Attack, you could Rapid Shot by throwing the hammer and quickdrawing another one. But all three attacks would have to be at -2, including the sword swing. Or the other way around, Rapid Shot to throw a pair of hammers then quickdraw to draw your sword and swing at an adjacent enemy (or even 5'-move to get adjacent to him).
In my opinion, all of that should be valid, but not all GMs would agree with me.