Don't know what your idea is.. but a thought or plugin is what about an anonymous place for people to vent or answer the question.. Why I wish I were dead: I have 6 toes on my left foot. others can respond anonymously..about that... some sort of peer group online/ facilitated instant support group.
I'm sorry, but this will be overrun by trolls and give out unhelpful/bad advice. Plus, there are already forums for this.
National Suicide Prevention Hotline:
1-800-273-8255 There's trained people to give support on these very issues. There's other numbers you can call as well. Check them out.