I think the issue with suicide is that we have to walk a very fine line. If people are thinking about it, encouraging them to talk about it and us to give the person advice and encourging the user to seek professional assistance (as we are not professionals ourselves) should be our mandate. We however cannot have user encouraging others to commit suicide.
As far as tracking users, IPs can change and I do not know whether the ISPs can contact authorities or not (and due to the RIAA's actions, ISPs tend to want to stay out of legal things). If the person notes where they reside, then we may be able to contact someone. I think the mods/admins should try their best in a serious situation but the should not be responsible. We are not required reporters.
Finally, a time limit on bans would be a good idea. Kinda of as a reward for good behavior.
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Louis J Bouchard
Rochester Minnesota
"Only when all those who surround you are different, do you truly belong."
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Fred Tate Little Man Tate