It's an interesting topic, but i'm highly in favor of free will. In waking life i am and in dreams i am. The thing is i don't believe your own will should be imposed on other people's will, which generally excludes things like murder and rape. The difference in dreams is that there is no free will bar that of your own, so you can't impose your will upon anybody because there's nobody to impose it on. Killing people wouldn't do anything. The question is not whether it's moral or not, as there are no permanent consequences to any actions, nor is any harm actually done to anybody. The question is whether the dreamer can handle these actions or not. That's where short term damage might be done. If somebody tries it and it makes them feel guilty and sick, then that is a real life consequence, but it only directly affects the dreamer, and i wouldn't imagine it lasting for very long.

Personally, i'm not sure if i could ever do it. I've had a number of lucid dreams, but i've not had a lot of control. And when i have been lucid i've never so much as thought about it. I have tried to throw a cat over a balcony though! I wasn't going to let it fall though, as i intended to turn it into something and have it fly away. I couldn't pick it up anyway. I also once had sex with somebody against their will in a non lucid dream. I did feel horrible about that for a bit, and it wasn't even violent. I don't think i could consciously do something like that at all, dream or not. I don't think i've ever killed anybody in a dream though so i'm not sure about that. I don't have a problem with the idea at all though. In some ways it may be beneficial to a person's stress levels etc.