Swap right command with right alt/option on external bluetooth keyboard

KeyRemap4MacBook also supports device-specific settings:

<?xml version="1.0"?>
<root>
  <devicevendordef>
    <vendorname>KINESIS</vendorname>
    <vendorid>0x05f3</vendorid>
  </devicevendordef>
  <deviceproductdef>
    <productname>ADVANTAGE</productname>
    <productid>0x0007</productid>
  </deviceproductdef>
  <item>
    <name>modifierkeys</name>
    <identifier>modifierkeys</identifier>
    <device_only>DeviceVendor::KINESIS, DeviceProduct::ADVANTAGE</device_only>
    <autogen>__KeyToKey__ KeyCode::CONTROL_L, KeyCode::FN</autogen>
    <autogen>__KeyToKey__ KeyCode::FN, KeyCode::CONTROL_L</autogen>
    <autogen>__KeyToKey__ KeyCode::COMMAND_L, KeyCode::OPTION_L</autogen>
    <autogen>__KeyToKey__ KeyCode::OPTION_L, KeyCode::COMMAND_L</autogen>
  </item>
</root>

You can see the vendor and product IDs from EventViewer.app. If it can't remap any keys on the external keyboard, try uninstalling other keyboard or HID drivers.

See the source for the key code values and predefined settings.

1. Download and install KeyRemap4MacBook.

2. Open EventViewer:

   open /Applications/KeyRemap4MacBook.app/Contents/Applications/EventViewer.app
   

3. Press the key that you wish to customise and note the KeyCode:::

   

4. Create a private.xml like this:

   <?xml version="1.0"?>
   <root>
     <item>
       <name>Modifier Remapping</name>
       <identifier>modremap</identifier>
       <autogen>__KeyToKey__ KeyCode::CONTROL_L, KeyCode::COMMAND_L</autogen>
     </item>
   </root>
   

   Replace KeyCode::CONTROL_L with the key that you wish to change and KeyCode::COMMAND_L with the key that you wish to replace it with.