I disagree with you on some points, Oglar, and agree with you on others.
Does morality imply emotion/feeling? I'm not convinced it does.
It does. If a person is completely without empathy, then they have no basis from which to form a morality. The closest a competely disempathic person could come would be to approximate a moral system based on consequence. You don't do
X, because if you do
X it has
Y reprocussions. However, the completely disempathic person would have no inherrant sense of right and wrong as they applied to anyone that wasn't them. If faced with a moral decision that was outside of their realm of experience and to which they couldn't draw inference from a different but similar situation with which they were familiar, they would have an equal chance of making the "wrong" decision versus the "right" one. Assuming no other factors, of course.
Similarly, rage doesn't need to be an emotion -- it could be a purely physical response like pumping super adrenaline (or 100 octane fuel) in response to a flight-or-fight scenario. Just because we've named the game mechanic after an emotion doesn't necessarily mean it must be one.
This one I agree with you on, 100%. What is Rage in a human barbarian could just as easily (and just as reasonably, if not more so) be Overdrive in a warforged barbarian. A built-in mechanism, maybe inherrant to all warforged, though only some know how to access it, that can redirect power from certain systems (primarily mental ones) to others (primarily physical ones), but its use puts stress on the warforged's systems as a whole.
The warforged barbarian doesn't Get Mad, he activates a subsystem. The warforged Frenzied Berzerker, on the other hand, crosses that line. He's already had access to his overdrive (the rage pre-requisite for the class), but now he no longer has full control over when and where it activates. FBs can involentarily go nuts when they get hit, or insulted, or frustrated and have to make a will save to hold themselves back. There are now irrational triggers to his overdrive that he has no control over, and has to fight against if he wants to keep in check. The warforged barb and FB are still using the same subsystem - it's just that the FB lets it run absolutly rampant when it activates. Ignores safety measures such as where and how much energy is redirected. Purposefully overloads certain breakers, blows them, and then intentionally leaves them unrepaired. Things like that.
If warforged do feel, but are emontionally unevolved, it could mean that the majority of them aren't quite stable, given that their first experiences were to be thrown into a major war. That sort of experience can have severe, long-lasting psychological effects on perfectly stable humans; imagine taking a five-year-old emotional intellect and subjecting it to that kind of strain.
As I mentioned above, I'm not so sure it would neccessarily work the same way with the psychology of a warforged versus the psychology of a human. If you had a human that was drilled from the moment of his birth for battle situations, you would end up with something approximating a warforged's psychology. Battle wouldn't be stressful in the same way for them, because they didn't develop mentally in a peace-time situation. It's not alien to them; it's not outside their norm like it would be for some human who grew up with a mom and a dad in some villiage, and then signed up for military service when the call came down.
The Rambo analogy is still a good one, though, but for different reasons. The Rambo character was left dysfunctional after his military service - he found it damn near impossible to go back to being
John instead of staying the course and still being
Rambo. His mind just had one hell of a time wrapping itself around the concept of not being a soldier any more; it wasn't a switch he could flip, it now sat at the core of how he defined his identity as a human being. I could easily see warforged being the same way, if not more so. Being a soldier is who and what they are. It's the whole reason they exist in the first place. And now, the war's over and they're not needed any longer. Here's your discharge papers - good luck. Drop us a line some day and tell us how things worked out.