Extension: Keyboard shortcut for menu item

Hi,

in my extension I have an .xcu file (beginning of file see below). How
can I assign a keyboard shortcut to a menu item (e.g. node
"010:edit:change")? The schema only offers to put an icon in the
beginning of the menu line. But many LO menus have a shortcut defined at
the end of the menu line, e.g. F1 for help.

Thanks,
Jan

<?xml version='1.0' encoding='UTF-8'?>
<oor:component-data xmlns:oor="http://openoffice.org/2001/registry";
xmlns:xs="http://www.w3.org/2001/XMLSchema"; oor:name="Addons"
oor:package="org.openoffice.Office">
  <node oor:name="AddonUI">
    <node oor:name="OfficeMenuBar">
      <node oor:name="de.gmx.rheinlaender.jan.imath" oor:op="replace">
        <prop oor:name="Title" oor:type="xs:string">
          <value xml:lang="de">iMath</value>
                <value xml:lang="en-US">iMath</value>
              </prop>
        <prop oor:name="Context" oor:type="xs:string">
         
<value>com.sun.star.text.TextDocument,com.sun.star.text.GlobalDocument</value>
        </prop>
              <prop oor:name="ImageIdentifier" oor:type="xs:string">
                <value/>
              </prop>    
              <node oor:name="Submenu">     
                <node oor:name="010:edit" oor:op="replace">
                  <prop oor:name="URL" oor:type="xs:string">
              <value/>
            </prop>
            <prop oor:name="ImageIdentifier" oor:type="xs:string">
              <value/>
            </prop>
            <prop oor:name="Title" oor:type="xs:string">
              <value xml:lang="de">Bearbeiten</value>
              <value xml:lang="en-US">Edit</value>
            </prop>
            <prop oor:name="Target" oor:type="xs:string">
              <value>_self</value>
            </prop>
                  <node oor:name="Submenu">
                    <node oor:name="010:edit:change" oor:op="replace">
                <prop oor:name="URL" oor:type="xs:string">
                  <value>de.gmx.rheinlaender.jan.imath:edit:edit</value>
                </prop>
                <prop oor:name="ImageIdentifier" oor:type="xs:string">
                  <value/>
                </prop>   
                <prop oor:name="Title" oor:type="xs:string">
                  <value xml:lang="de">Bearbeiten</value>
                  <value xml:lang="en-US">Edit</value>
                </prop>
                <prop oor:name="Target" oor:type="xs:string">
                  <value>_self</value>
                </prop>
              </node>