It is very simple to create such macros, but whether they are more useful than the built-in zoom function is debatable.
http://www.gmayor.com/installing_macro.htm
Code:
Sub Zoom100()
With ActiveWindow.View
If Err.Number = 4248 Then Exit Sub
.Type = wdPrintView
.Zoom = 100
End With
End Sub
Sub Zoom150()
With ActiveWindow.View
If Err.Number = 4248 Then Exit Sub
.Type = wdPrintView
.Zoom = 150
End With
End Sub
Perhaps more useful would be a macro to toggle between 100% and 150%?
Code:
Sub ToggleZoom()
With ActiveWindow.View
If Err.Number = 4248 Then Exit Sub
.Type = wdPrintView
If Not .Zoom = 100 Then
.Zoom = 100
Else
.Zoom = 150
End If
End With
End Sub