Well, to help cut down on a little of that overhead, here is the entire python script to "flatten" V4's feet. :-)
Copy into a text editor, save somewhere in Poser's Python scripts (with a .py extension, not .txt)
Operates from within Poser.
I've re-jigged it slightly; it now takes less than 1 second for a 100 frame anim.
Oh, and the previw display will (probably) look distorted when the script finishes (it seems to get confused as to whether it should be showing the 1st or last frame), but move the cursor into the preview and everything is OK.

The script:

#-----------------------------------------------------------------------------

Set V4 to "no high heels"

Copyright (c) 2007 John Avery (Diolma)

5th Nov 2007

V4 must be selected for the script to run properly.

All key-frames for the left and right feet will have their "Bend" values reduced by 25 degrees.

It is not advisable to run this script twice!

#-----------------------------------------------------------------------------

from Tkinter import *
import poser
scene = poser.Scene()

#-----------------------------------------------------------------------------

Next section is TK

#------------------------------------------------------------

class App:
   
    # - - - - - - - - - - - - - - - - - -
    def init(self, master, textMessage):
        self.master = master
        master.title("V4 Flat-foot")

        self.StatusEntry = Entry(self.master,width=50)
        self.StatusEntry.grid(row=0,column=0,columnspan=2)
        self.StatusEntry.insert(0,"Select the figure then click GO")

        # Go/nogo buttons.
        self.buttonGo = Button(self.master, text="GO", command=self.doGo)
        self.buttonGo.grid(row=3, column=0)

        self.buttonCancel = Button(self.master, text="Cancel", command=self.doCancel)
        self.buttonCancel.grid(row=3, column=1)

        self.master.protocol('WM_DELETE_WINDOW', self.doCancel)
       
    # - - - - - - - - - - - - - - - - - -
    def ShowStatus(self,S): # Just saving repetition
        self.StatusEntry.delete(0,END)
        self.StatusEntry.insert(0,S)
        self.StatusEntry.update_idletasks()

    # - - - - - - - - - - - - - - - - - -
    def Update(self):
        if scene: scene.ProcessSomeEvents(1)
        root.lift()
        root.after(100, self.Update)

    # - - - - - - - - - - - - - - - - - -
    def doGo(self):
       
        # - Sanity check...
        try:
            Figure = scene.CurrentFigure()
            LFoot = Figure.Actor( "Left Foot" )
            RFoot = Figure.Actor( "Right Foot" )
        except:
            if not Figure:
                self.ShowStatus( "No figure selected" )
            else:
                self.ShowStatus( "%s: One or both feet missing!" % Figure.Name() )
            return
                        
        # - OK, do it.
        self.ShowStatus( "Left Foot" )
        self.doActor( LFoot )
        self.ShowStatus( "Right Foot" )
        self.doActor( RFoot )

        scene.SetFrame(0)
        self.master.destroy()

    # - - - - - - - - - - - - - - - - - -
    def doCancel(self):
        self.master.destroy()
       
    # - - - - - - - - - - - - - - - - - -
    def doActor( self, Actor ):

        Bend = Actor.Parameter( "Bend" )
        
        F=0                         # Init Frame number
        while 1:                    # Forever (except we'll break out eventually)
            scene.SetFrame(F)
                     
            # Deal with this frame
            Bend.SetValue( Bend.Value() - 25.0 ) # 25.0 is approx V4's "Flatfoot"
                       
            F=Bend.NextKeyFrame()
            if not F: break         # No more - break out of the loop.
        # End while 1

#------------------------------------------------------------

Activate the loop

#------------------------------------------------------------

root = Tk()
app = App(root, '')
app.Update()
root.mainloop()

#------------------------------------------------------------

End TK loop.

#-----------------------------------------------------------------------------

That's all there is.
My 1st ever Python script!

Cheers,
Diolma