Auto-logout:
I think this feature already exists. When you log in, do not check "Remember Me".
I personally like not having to log in all the time. It's no problem on a device that's secure.
Edit posts & thread titles for an unlimited time:
Not a good idea in my opinion either. Too much room for abuse. People can edit their 5 year old posts and put false information there. Would be hard to verify at that point.
If it's really important to change something later, people can always just PM an admin to do it.
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