to change your diffuse colors quickly try this

# -*- coding: utf-8 -*- 
# ©copyright structure 2001 - 2020
# ================================

import poser
import wx
scene = poser.Scene()
materials = scene.CurrentFigure().Materials()

import wx.lib.agw.cubecolourdialog as CCD

#----------------------------------------------------------------------
def colorDialog():
    """
    This is mostly from the wxPython Demo!
    """
    dialog = wx.ColourDialog(None)
    
    # Ensure the full colour dialog is displayed, 
    # not the abbreviated version.
    dialog.GetColourData().SetChooseFull(True)
    if dialog.ShowModal() == wx.ID_OK:
        data = dialog.GetColourData()
        return (data.GetColour().Get())
        
    dialog.Destroy()

#----------------------------------------------------------------------
def RGBToPoserCol(rgb):return tuple([x/255.0 for x in rgb]) #courtesy of Snarlygribbly
#----------------------------------------------------------------------

r,g,b = RGBToPoserCol( colorDialog() )

for material in materials:
    tree = material.ShaderTree()
    nodes = tree.Nodes()
    for node in nodes:
        if node.IsRoot() and not node.Type() == "CyclesSurface":
            inputs = node.Inputs()
            i = inputs[0]
            i.SetColor( r, g, b )
            tree.UpdatePreview()

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