Slice by VerticalHorizontal View

thanks.

You can already do this in regular max...

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Max has a way to do this without using a script.
Select the vertices, then hold down Shift and click the icon of EDGE subobject level(next to the verts icon, below the modifier stack).

You can edit your script and instead of using

        $.EditablePoly.ConvertSelection #Vertex #Edge
	subobjectLevel = 2
	$.EditablePoly.ShrinkSelection ()

(this is the same as Ctrl+click over the EDGE icon)

you can use:

        $.EditablePoly.ConvertSelectionToBorder #Vertex #Edge
        subobjectLevel = 2

:)