Well, since Condorcet is (to the best of my knowledge) never used in public elections and rarely used in private groups, I don't know whether the 0.5 votes each is a standard convention or not. It wouldn't change the margins, so it would be applicable to margins methods. Certainly it would be necessary for winning votes methods.
No, absolutely not. When you add half-votes, the results for winning votes become identical to margins. The whole point of winning votes is you only count the votes FOR the candidate in a pairwise contest.
I agree with Adam and this is why I do not add the .5 vote thing within my implementation. For a voter to have a say in any pairwise contest, they must provide unambiguous information concerning that contest...otherwise, I will assume nothing about what their opinion might be.
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