There are really two parts to this -- First is that there should be a special page introducing new users to the system that ought to be linked from the account confirm email, and/or the account confirm screen. I haven't done this yet because several other new account things need fixing too, and I figured I'd get it all in one whack.
The other thing, about cookie longevity, is something that's also been planned but not implemented yet. You ought to be able to set "cookie life" in your user prefs (like, "browser session", "3 days", "1 week", etc). The hooks are in place for it in our cookie code, it just hasn't been added to the user prefs yet.
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