OpenERP: How to override an inherited view’s action

I’d like to supress the display of the Stock Value Variation chart on the default view of the Manufacturing page. I’m using inheritance to modify the form. Right now I can inherit the form and get additional actions to show up. However, I’m not able to use position=”replace” for an action, form, or on the “arch” field. So how do I stop display of the Stock Value Variation, or the other graphs?

Background:
I’m new to OpenERP, and I’m trying to use the Manufacturing module to create a custom app for tracking prototype hardware development. Much of the functionality I want is already there, so OpenERP is a natural fit. However, the first step is to disable anything unnecessary. Inheriting and replacing fields to stop them from showing up hasn’t been a problem, but I’m not having any luck getting rid of the actions that create reports and graphs.

Related questions:

• Would it be better to leave the Manufacturing pages alone, and create
  a whole new “Prototypes” module? In other words, right now I’m trying
  to change the behavior of the Manufacturing pages — would it be
  better to create a new module and add a “Prototypes” button along
  with Sales/Purchase/Warehouse/Manufacturing/Accounting/Settings at
  the top of the default page?

• I’m not sure where the extra “Change Layout” button at the top of the
  default Manufacturing page is comming from, or how to get rid of
  that. Any ideas?

• Is the problem I’m having derived from the dynamic names and refering
  to them in another module? (E.g. the
  name=”%(procurement.procurement_exceptions)d” in mrp_boot_view.xml).

OpenERP 6.1 on Windows, install everything locally.

Here’s the code:

__openerp__.py:

{
    "name" : "prototyping tool",
    "version" : "0.1",
    "author" : "",
    "website" : "",
    "category" : "Manufacturing",
    "sequence": 19,
    "images" : [],
    "depends" : ["mrp", "base"],
    "description": """initial version doesn't do much, simplifies MRP views.""",
    'init_xml': [],
    'update_xml': ["mrp_boot_view.xml"],
    'demo_xml': [],
    'test': [],
    'installable': True,
    'application': True,
    'auto_install': False,
    'certificate': '',
}

__init__.py:
    import mrp_boot
    import mrp

mrp_boot.py:

# None of this functionality is currently used

import mrp_boot
import mrp

from osv import fields, osv

class mrp_boot(osv.osv):
   _name = "mrp_boot"
   _inherit = "purchase.order"

   def _get_boot_expense_category(self, cursor, user_id, context=None):
       return (
           ('NRE', 'NRE'),
           ('MatProto', 'Materials / Prototype'),
           ('Capital', 'Capital'),
           ('Loaner', 'Loaner'))

   _columns = {
       'boot_expense_category':
           fields.selection( _get_boot_expense_category
                           , 'Expense Category'
                           , help="How the equipment for the entire PO is to be expensed. If multiple methods will be used, multiple POs must be created"),
       }

mrp_boot()

mrp_boot_view.xml:

# I'd like to supress the display of the charts generated by the actions 
<?xml version="1.0" ?>

<openerp>
<data>
     <record id="board_mrp_manager_form" model="ir.ui.view">
          <field name="name">board.mrp.manager.form</field>
          <field name="model">board.board</field>
          <field name="inherit_id" ref="mrp.board_mrp_manager_form" />
          <field name="type">form</field>
          <field name="priority" eval="15"/>
          <field name="arch" type="xml">

               <form string="Manufacturing board">
                    <board style="2-1">
                        <column>
                            <action name="%(procurement.procurement_exceptions)d" string="New Prototype Outlook" domain="[('state','=','exception')]"/>
                        </column>
                        <column>
                        </column>
                    </board>
                </form>

          </field>
     </record>
</data>
</openerp>