I dissagree on the F6 function. Because people vote to make it a replay, and if you dont want to vote or dont like the vote, just dont vote.
After all its just the majority that decides if the replayvote passes or not, so it doesnt matter if you vote negative or not at all.
If a setting with a ratio should be implemented, mmm normally its just a majority, or you should as admin think that a vote should get a higher percentage to pass then a normal majority. Such as 60% or 70% or even 80%, all higher then 51%. Imo not really needed but that is just my opinion.