something like this?

extrudo.py

def operator_helper_cursor_norotate(layout):
    layout.operator_invoke = 'INVOKE_DEFAULT'
    layout.operator("mesh.dupli_extrude_cursor", text="Dupli Extrude", icon='DUPLI_EXTRUDE')

def operator_helper_cursor_rotate(layout):
    layout.operator_invoke = 'INVOKE_DEFAULT'
    m = layout.operator("mesh.dupli_extrude_cursor", text="Dupli Extrude", icon='DUPLI_EXTRUDE_ROTATE'),
    m.rotate_source = True


class VIEW3D_MT_edit_mesh_extrude(Menu):
    bl_label = "Extrude"

    _extrude_funcs = {
        'VERT': lambda layout:
            layout.operator("mesh.extrude_vertices_move", text="Vertices Only"),
        'EDGE': lambda layout:
            layout.operator("mesh.extrude_edges_move", text="Edges Only"),
        'FACE': lambda layout:
            layout.operator("mesh.extrude_faces_move", text="Individual Faces"),
        'INDIVIDUAL': lambda layout:
            layout.operator("view3d.edit_mesh_extrude_individual_move", icon='EXTRUDE_INDIVIDUAL', text="Individual"),
        'REGION_VERT_NORMAL': lambda layout:
            layout.operator("view3d.edit_mesh_extrude_move_shrink_fatten", text="Region (Vertex Normals)"),
        'DUPLI_EXTRUDE': operator_helper_cursor_norotate,
        'DUPLI_EX_ROTATE': operator_helper_cursor_rotate
    }