What do /you/ suggest we call it, that still fits the pattern from the other two, and has the same semantics. Oh, and that won't confuse people upon seeing it change?

I would suggest "abstain" or "defer", to differentiate it from a vote. That lack of differentiation is the reason people find it non-intuitive, after all.

A Perly label that would be (IMO) no more confusing than "+=0" would be "#": commenting out the previously indicated vote (on the other hand, you're not actually making a comment). Or "sleep", which connotes that you may do something later, but not now. I rather like that one.

Update: Another idea: "=undef", since as long as you choose that option, the node has no mathematical rating from your perspective.

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