To prevent such things from happening, as GM, I discuss the matter with the players before the campaign starts. I do NOT disallow such things from happening, I just discourage them. However, I am always willing to allow such things.
As for torture, despite popular beliefs and due to TV shows and movies, it has been proven to be one of the most ineffective means of getting information. I prefer to do things like they did in one episode of NCIS. One person talks, and I mean just "talks", with the prisoner while others, who are specifically trained to notice things like body language, actual wording of responses, connecting a seemingly innocuous comment to another tidbit of known information, etc., etc. Doing this, the person doing the watching is actually interpreting the prisoner and makes the connection to the threat. Problem solved, or another adventure pops up.
As for the stray shots, specifically with bowman firing into the middle of melee, yes, I have had characters shoot other characters. Even I as a bowman have shot other PCs. And, I have been shot/hit by other PCs. However, most of the RPGers I have played with understand that this can happen AND shall happen, even by total accident. Such things will happen.
As for the Berserker, as said above, I do not disallow it, I just discourage it. Has anyone else here ever watched that series "Vikings"? If not, then do so. However, it is NOT recommended for the weak of heart or weak of stomach. But it is a most excellent show.
As for Lycanthropy, especially the uncontrolled bestial form, again, I do not disallow it, just discourage.
However, I have had a PC that was a were-bear of the uncontrolled bestial form, actually became a great hero to a people. The player played the part perfectly. Instead of seeking the fame and fortune, he actually accepted the hero status, then quietly disappeared. He disappeared due to the fact that he (the character) could not control the bestial form. In his human form, the character was actually a somewhat gentle pacifist. Thus, he chose to disappear so he would no longer cause any harm. Since he was bestowed with some treasures, he was able to live his life in peace with the occasional adventure when his friends (other PCs) needed his help.
rmfr