When using the Feature Request Forums, replying to a post with a +1 may add visibility, but it does not actually vote for the feature request.
Voting on a feature request is accommplished by using the star rating system on the original post for that particular feature.
The star rating system has 4 options:
1 = Bad
2 = Average
3 = Good
4 = Excellent
Select the number of stars you feel the feature rquest deserves to cast your vote: