To add more pallets, you need to edit the mainButtons.py file in a text editor (don't use Word). Lines 8 and 9 load 2 new pallets called custombuttons.py and custom2.py respectively. Those pallets are set up in the same format. I think I just made copies of the mainbuttons.py and edited them. You can find the mainbuttons.py in Runtime\Python\poserScripts under the folder where Poser is installed (as opposed to your content runtime).

import poser

poser.DefineScriptButton(1,  ":Runtime:Python:poserScripts:PythonPalette:geomModButtons.py", "Geom Mods")
poser.DefineScriptButton(2,  ":Runtime:Python:poserScripts:PythonPalette:utilityButtons.py", "Utility Funcs")
poser.DefineScriptButton(3,  ":Runtime:Python:poserScripts:PythonPalette:callbackButtons.py", "Sample Callbacks")
poser.DefineScriptButton(4,  ":Runtime:Python:poserScripts:PythonPalette:renderButtons.py", "Render / IO")
poser.DefineScriptButton(5,  ":Runtime:Python:poserScripts:PythonPalette:materialModButtons.py", "Material Mods")
poser.DefineScriptButton(6,  ":Runtime:Python:poserScripts:PythonPalette:printInfoButtons.py", "Print Info")
poser.DefineScriptButton(7,  ":Runtime:Python:poserScripts:PythonPalette:propButtons.py", "Prop Samples")
poser.DefineScriptButton(8,  ":Runtime:Python:poserScripts:custombuttons.py", "Custom")
poser.DefineScriptButton(9,  ":Runtime:Python:poserScripts:custom2.py", "More")
poser.DefineScriptButton(10, ":Runtime:Python:PoserScripts:clearButtons.py", "Clear Buttons")

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I use Poser 13 and win 10