Not voting has to count as a no vote, or when the first vote for restart has been cast it would be 1 yes against 0 no's, so it would pass instantly as a 100% yes vote.
Requiring a no vote, even if it maybe counts as double wouldn't work I think. It would be a race to press no quick before all the restarters vote yes (which is usually pretty quick
).
Maybe there just needs to be an option to up the %age of voters required for a pass.
I haven't been online yet since the new patch so I don't know if the new time limits added have made things better or not.