How to allow non-registered users to post & vote as a guest or anonymous?

Question

Is it possible to allow non-registered users to interact or login as "guest" or "anonymous" to post questions, answers, and VOTE? I am mainly interested the ability for anonymous/guest voting, as it would make the site more user friendly and provide a good option for people who don't want bother with registering in order to interact with the site. I see there have been a number of questions from people interested in allowing anonymous voting, but the answers have been that it would require a code-overhaul in order to track IP's to control voting limits. Is there not a work-around where all anonymous users could logon or interact under a guest account? Thanks for any input or advice on this!

Comments

I think the main issue is that it's too open for spam.
There is also no way for a user to ensure their votes are kept as most people's IPs change regularly.

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Regardless IP changes as it's not issue in some projects is it hard to do ? Related question http://www.question2answer.org/qa/34307

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I think with help of this code https://github.com/cyberbuff/Pulse-Lite ,voting feature can be implemented. I tried it without q2a works fine and safe, but have no idea how it can be used with q2a.