I don't have the standard V3, but I do have V3 RR (reduced resolution) this figure does have all the scale channels in the legs.

I find it hard to believe that V3 does not have the same scale channels. Have you scrolled right down to the bottom of the paramiters pallet? I suppose it's possible that the scale dials have been hidden in V3, though I can't think that why DAZ would do that. If they have been hidden then a pose file should be able to fix that. Try the one attached above, save it to a poise folder without the ".TXT" part of the file name.