/usr/share/afterstep/scripts/PointerSetup is in afterstep-data 2.2.12-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | WindowTitle {Pointer}
WindowSize 320 290		# Taille
WindowPosition 191 50		# Position
ForeColor	{black}
BackColor	{grey85}
ShadowColor	{grey55}
HilightColor	{grey100}
Font		-adobe-helvetica-bold-r-*-*-12-*
Init
 Begin
  WarpPointer 2
  Set $tmp=(GetOutput {xset -q} 10 2)
  Set $pos=1
  While (StrCopy $tmp $pos $pos)<>{/} Do
   Set $pos=(Add $pos 1)
  Set $pos=(Add $pos -1)
  
  ChangeValue 6 (Div (Mult (StrCopy $tmp 1 $pos) 20) (StrCopy $tmp (Add $pos 2) 256))
  ChangeTitle 8 (GetOutput {xset -q} 9 4)
 End
 
Widget 1
Property
 Size 50 30
 Position 70 230
 Type PushButton
 Title {Apply}
Main
 Case message of
  SingleClic :
  Begin
   Do {Exec "xset" xset m } (GetValue 6) {/20 } (GetTitle 8)
   If (GetValue 4) == 1 Then
    Do {Exec "xmodmap" xmodmap -e "pointer = 1 2 3"}
   Else
    Do {Exec "xmodmap" xmodmap -e "pointer = 3 2 1"}
  End
End
Widget 2
Property
 Size 50 30
 Position 160 230
 Type PushButton
 Title {OK}
Main
 Case message of
  SingleClic :
  Begin
   Do {Exec "xset" xset m } (GetValue 6) {/20 } (GetTitle 8)
   WriteToFile .xinitrc-fvwm {xset m } (GetValue 6) {/20 } (GetTitle 8)
   If (GetValue 4) == 1 Then
   Begin
    Do {Exec "xmodmap" xmodmap -e "pointer = 1 2 3"}
    WriteToFile .xinitrc-fvwm {xmodmap -e "pointer = 1 2 3"}
   End
   Else
   Begin
    Do {Exec "xmodmap" xmodmap -e "pointer = 3 2 1"}
    WriteToFile .xinitrc-fvwm {xmodmap -e "pointer = 3 2 1"}
   End
   Quit
  End
End
Widget 3
Property
 Size 50 30
 Position 250 230
 Type PushButton
 Title {Cancel}
Main
 Case message of
  SingleClic :
  Begin
   Quit
  End
End
Widget 4
Property
 Position 150 140
 Type PopupMenu
 Title {Right-handed user|Left-handed user}
 Value 1
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 5
Property
 Position 20 145
 Type ItemDraw
 Title {Mouse configuration:}
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 6
Property
 Size 188 1
 Position 110 25
 MinValue 5
 MaxValue 100
 Type HScrollBar
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 7
Property
 Position 20 45
 Type ItemDraw
 Title {Acceleration:}
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 8
Property
 Size 60 1
 Position 150 90
 Type TextField
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 9
Property
 Size 110 1
 Position 20 95
 Type ItemDraw
 Title {Threshold (pixels):}
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 10
Property
 Size 300 190
 Position 10 10
 Type Rectangle
Main
 Case message of
  SingleClic :
  Begin
  End
End
Widget 11
Property
 Position 15 3
 Type ItemDraw
 Title {Pointer}
Main
 Case message of
  SingleClic :
  Begin
  End
End
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