Remap all keys when holding down left and right commands. This version is for dvorak keyboards.

BothCommandKeysPressed.xml

<?xml version="1.0"?>
<root>
	<item>
	    <name>Alt keyboard with Command_L + Command_R</name>
	    <item>
	      <name>Rebind all keys when both command keys are pressed</name>
	      <identifier vk_config="true">notsave.smp_alt_keyboard</identifier>
	      <autogen>__KeyToKey__ KeyCode::A, 		KeyCode::MINUS</autogen> <!-- A to [ -->
	      <autogen>__KeyToKey__ KeyCode::SEMICOLON, KeyCode::EQUAL</autogen> <!-- S to ] -->
	      <autogen>__KeyToKey__ KeyCode::S, 		KeyCode::MINUS, ModifierFlag::SHIFT_L</autogen> <!-- O to { -->
	      <autogen>__KeyToKey__ KeyCode::L, 		KeyCode::EQUAL, ModifierFlag::SHIFT_L</autogen> <!-- N to } -->
	      <autogen>__KeyToKey__ KeyCode::D, 		KeyCode::KEY_9, ModifierFlag::SHIFT_L</autogen> <!-- E to ( -->
	      <autogen>__KeyToKey__ KeyCode::K, 		KeyCode::KEY_0, ModifierFlag::SHIFT_L</autogen> <!-- T to ) -->
		  
		  <!-- Pushing these keys will not do anything -->
		  <autogen>__KeyToKey__ KeyCode::Q, 		KeyCode::VK_NONE</autogen> <!-- ' to none -->
		  <autogen>__KeyToKey__ KeyCode::W, 		KeyCode::VK_NONE</autogen> <!-- , to none -->
		  <autogen>__KeyToKey__ KeyCode::E, 		KeyCode::VK_NONE</autogen> <!-- > to none -->
		  <autogen>__KeyToKey__ KeyCode::R, 		KeyCode::VK_NONE</autogen> <!-- P to none -->
  		  <autogen>__KeyToKey__ KeyCode::T, 		KeyCode::VK_NONE</autogen> <!-- Y to none -->
		  <autogen>__KeyToKey__ KeyCode::Y, 		KeyCode::VK_NONE</autogen> <!-- F to none -->
		  <autogen>__KeyToKey__ KeyCode::U, 		KeyCode::VK_NONE</autogen> <!-- G to none -->
		  <autogen>__KeyToKey__ KeyCode::I, 		KeyCode::VK_NONE</autogen> <!-- C to none -->
		  <autogen>__KeyToKey__ KeyCode::O, 		KeyCode::VK_NONE</autogen> <!-- R to none -->
		 <!-- Used in moving <autogen>__KeyToKey__ KeyCode::P, 		KeyCode::VK_NONE</autogen> <!-- L to none -->
  		  <autogen>__KeyToKey__ KeyCode::F, 		KeyCode::VK_NONE</autogen> <!-- U to none -->
  		  <autogen>__KeyToKey__ KeyCode::G, 		KeyCode::VK_NONE</autogen> <!-- I to none -->
  		  <autogen>__KeyToKey__ KeyCode::H, 		KeyCode::VK_NONE</autogen> <!-- D to none -->
  		 <!-- Used in moving <autogen>__KeyToKey__ KeyCode::J, 		KeyCode::VK_NONE</autogen> <!-- H to none -->
		  <autogen>__KeyToKey__ KeyCode::Z,		KeyCode::VK_NONE</autogen> <!-- : to none -->
  	      	  <autogen>__KeyToKey__ KeyCode::X, 		KeyCode::VK_NONE</autogen> <!-- Q to none -->
		 <!-- Used in moving <autogen>__KeyToKey__ KeyCode::C, 		KeyCode::VK_NONE</autogen> <!-- J to none -->
		 <!-- Used in moving <autogen>__KeyToKey__ KeyCode::V, 		KeyCode::VK_NONE</autogen> <!-- K to none -->
		  <autogen>__KeyToKey__ KeyCode::B, 		KeyCode::VK_NONE</autogen> <!-- X to none -->
		  <autogen>__KeyToKey__ KeyCode::N, 		KeyCode::VK_NONE</autogen> <!-- B to none -->
		  <autogen>__KeyToKey__ KeyCode::M, 		KeyCode::VK_NONE</autogen> <!-- M to none -->
	      	  <autogen>__KeyToKey__ KeyCode::TAB, 		KeyCode::VK_NONE</autogen> <!-- TAB to none -->
		  
		  <!-- movement keys -->
 		  <autogen>__KeyToKey__ KeyCode::P, 		KeyCode::CURSOR_RIGHT, ModifierFlag::COMMAND_L</autogen> <!-- L to none -->
   		  <autogen>__KeyToKey__ KeyCode::J, 		KeyCode::CURSOR_LEFT, ModifierFlag::COMMAND_L</autogen> <!-- H to none -->
 		  <autogen>__KeyToKey__ KeyCode::C, 		KeyCode::CURSOR_DOWN, ModifierFlag::COMMAND_L</autogen> <!-- J to none -->
 		  <autogen>__KeyToKey__ KeyCode::V, 		KeyCode::CURSOR_UP, ModifierFlag::COMMAND_L</autogen> <!-- K to none -->
	    </item>
	    <item>
	      <name>Hold CMD_L+CMD_R and press any key for alt keyboard</name>
	      <identifier>remap.cmdcmd_to_alt_keyboard</identifier>
	      <autogen>__KeyToKey__ KeyCode::COMMAND_R, ModifierFlag::COMMAND_L | ModifierFlag::COMMAND_R, KeyCode::VK_CONFIG_SYNC_KEYDOWNUP_notsave_smp_alt_keyboard</autogen>
	      <autogen>__KeyToKey__ KeyCode::COMMAND_L, ModifierFlag::COMMAND_L | ModifierFlag::COMMAND_R, KeyCode::VK_CONFIG_SYNC_KEYDOWNUP_notsave_smp_alt_keyboard</autogen>
	    </item>
	  </item>
</root>

private.xml

<?xml version="1.0"?>
<root>
  <item>
		<name>Scott's bindings</name>
		
		<include path="BothCommandKeysPressed.xml" />
	
		<item>
			<name>Command_R+hjkl to Left/Down/Up/Right</name>
			<identifier>option.dvorak_vimode_commandr_hjkl</identifier>
			<autogen>__KeyToKey__ KeyCode::J, ModifierFlag::COMMAND_R, KeyCode::CURSOR_LEFT</autogen> <!-- h -->
			<autogen>__KeyToKey__ KeyCode::C, ModifierFlag::COMMAND_R, KeyCode::CURSOR_DOWN</autogen> <!-- j -->
			<autogen>__KeyToKey__ KeyCode::V, ModifierFlag::COMMAND_R, KeyCode::CURSOR_UP</autogen> <!-- k -->
			<autogen>__KeyToKey__ KeyCode::P, ModifierFlag::COMMAND_R, KeyCode::CURSOR_RIGHT</autogen> <!-- l -->
	    </item>
	
		<item>
			<name>No op arrow keys</name>
			<identifier>option.smp_no_arrow_keys</identifier>
			<autogen>__KeyToKey__ KeyCode::CURSOR_LEFT, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_DOWN, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_UP, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_RIGHT, KeyCode::VK_NONE</autogen>

			<autogen>__KeyToKey__ KeyCode::CURSOR_LEFT, ModifierFlag::COMMAND_L, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_DOWN, ModifierFlag::COMMAND_L, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_UP, ModifierFlag::COMMAND_L, KeyCode::VK_NONE</autogen>
			<autogen>__KeyToKey__ KeyCode::CURSOR_RIGHT, ModifierFlag::COMMAND_L, KeyCode::VK_NONE</autogen>
	    </item>
	</item>
	
</root>