(SPOILER)Seito "touching" Cobb's totem in Limbo did not strike me as breaking this rule, as it as in a dream. He never physically touched it, so he can not know the weight and dimensions of it. As for Moll, I took the "no one touch your totem" thing to mean that way only you knew the dimensions, weight, etc. While Moll obviously knew these things when living, after she died it hardly mattered.