I have a list that contains order information for multiple companies.  I have one user for each company who should be able to log in and see a filterded list that shows only their company information.

I was thinking that if I could create a name|value pair for each company using company_name|username and then filter the results based on the logged in user.  Can/should this be done in the "Filter Statement" in the Form and List ConfigurationForm and List Configuration?

I don't think you can do this in the Filter Statement when you have a specific filter for each company, at least not in one module. I have done a similar thing by filtering on user role and a value in a hidden column in an XSLT, which seems to work fine. I edited the advancedtable.xsl for this.

First I created another filter:

     <xsl:variable name="filteredDataA" select="udt:Data[udt:Categorie='Algemeen' or udt:Categorie='A']" />

Categorie is a hidden column and 'Algemeen' and 'A' are the values of that column. In your case I guess it would be something like:

     <xsl:variable name="filteredDataA" select="udt:Data[udt:Company='A']" />

Then I used a choose element which will pick a filter depending on the role of the logged in person:

           <xsl:choose>
              <!-- Logged in as CompanyA -->
              <xsl:when test="contains(//udt:Context/udt:UserRoles,'|CompanyA|')">
                <xsl:for-each select="$filteredDataA">
                  <!--Sorting-->
                  <xsl:sort select="*[name()=$param_orderby]" order="{$orderDirection}" data-type="{$orderType}" />
                  <xsl:if test="position() &gt; $from and position() &lt; $to">
                    <xsl:variable name="id" select="udt:UserDefinedRowId" />
                    <tr>
                      <xsl:attribute name="class">
                        <xsl:choose>
                          <xsl:when test="position() mod 2=1">
                        Normal UDT_Table_AlternateItem
                      </xsl:when>
                          <xsl:otherwise>
                        Normal UDT_Table_Item
                      </xsl:otherwise>
                        </xsl:choose>
                      </xsl:attribute>
                      <td>
                        <xsl:call-template name="detailLink">
                          <xsl:with-param name="id" select="udt:UserDefinedRowId" />
                        </xsl:call-template>
                      </td>
                      <xsl:for-each select="//udt:Fields">
                        <xsl:if test="udt:Visible='true' or udt:Visible='True'">
                          <td>
                            <xsl:variable name="NameOfValueColumn" select="udt:ValueColumn" />
                            <xsl:value-of select="//udt:Data[udt:UserDefinedRowId=$id]/*[name()=$NameOfValueColumn]" disable-output-escaping="yes" />
                          </td>
                        </xsl:if>
                      </xsl:for-each>
                    </tr>
                  </xsl:if>
                </xsl:for-each>
              </xsl:when>
            </xsl:choose>

This will only show records for role "CompanyA" where the value of column "Company" is "A". This means you will have to create different filters and <xsl:when ...> elements for each company.

I'm not sure this is the best/easiest way to do this, but I hope it helps.