This isn't just about avoiding misconduct. This suggestion deals with making discussions more concise. Do I think it would work? Well, not exactly, but no one here is asking to be babysat.
A like/thank you/+1/whatever button isn't a bad thing. Abusing any potential reward for getting one, yeah that could be bad. So don't tie it to any rewards. I don't think a dislike/no thank you/-1 whatever button would be bad either, but some might feel that way about it.
EDIT: Does anyone remember Roosterteeth's karma system? Mod points were like currency almost. You couldn't (heavily) abuse the system because you had to spend a mod point to mod someone's post. Karma went up and down over time based on activity and +/- mods received, and when you did gain karma or + mods, you gained mod points to spend.
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