This might just be something wrong with my setup, but I can't seem to get the plugin to work with data values. I can issue the /vi command to set the data value but the placed (or replaced) blocks have a default datavalue. interestingly when I replace a block with a non-zero data value, the new block has that value. (For example, if i snipe wool onto a block with a data value, like a spruce log, it comes out colored.) otherwise, it's always white.

Is there something I'm doing wrong?

I can make changes to data values using WorldEdit, so that's not an issue.

You're using the default performer, which is material only. http://voxelwiki.com/minecraft/VoxelSniper#Performers