Not really useful for characters like V3 that uses more than one map, but there IS an "Apply to All" feature in the material room. What I usually do is to save one head and one body map as a MT5 file, and then apply that one to the various bodyparts. Easier than navigating to the texture over and over again but not a true 1-click solution

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.