Script to connect all mia_materials in a Scene with Colorbuffers

 string $miaNode[] = `ls -type "mia_material_x_passes"`;
 for ($node in $miaNode)
 {
 	connectAttr -f ($node + ".indirect_raw") indirect_raw_buffer.color;
 	connectAttr -f ($node + ".indirect_raw") indirect_raw_buffer.evaluationPassThrough;
 }

  
  string $miaNode[] = `ls -type "mia_material_x_passes"`;
  string $buffer;
  for ($node in $miaNode)
  {
  	$buffer = `mrCreateCustomNode -asUtility "" writeToColorBuffer`;
  	$buffer = `rename $buffer ("indirect_raw_buffer_" + $node)`;
  	connectAttr -f ($node + ".indirect_raw") ($buffer + ".color");
  	connectAttr -f ($node + ".indirect_raw") ($buffer + ".evaluationPassThrough");
  
  	// you could repeat that for different buffer nodes if needed
  	$buffer = `mrCreateCustomNode -asUtility "" writeToColorBuffer`;
  	$buffer = `rename $buffer ("diffuse_raw_buffer_" + $node)`;
  	connectAttr -f ($node + ".diffuse_raw") ($buffer + ".color");
  	connectAttr -f ($node + ".diffuse_raw") ($buffer + ".evaluationPassThrough");
  }
  
   

    global proc RS_createRenderPasses()
    {
    	string $buffer, $pass, $shader;
    	string $miaNodes[] = `ls -type "mia_material_x_passes"`;
    	// you can add passes to the array
    	// passes have to be after the attribute for this script to work!
    	string $passes[] = {"refl_level", "refl_raw", "add_result", "indirect_raw"};
    	
    	// loop through all mia_material_x_passes shaders
    	for ($shader in $miaNodes)
    	{
    		// loop through passes
    		for ($pass in $passes)
    		{
    			// create scene pass if not existing
    			if (!`objExists $pass`)
    			{
    				// create custom color scene pass
    				createNode -n $pass renderPass;
    				applyAttrPreset $pass "C:/Program Files/Autodesk/Maya2011/presets/attrPresets/renderPass/customColor.mel" 1;
    				// associate scene pass with default render layer 
    				connectAttr -nextAvailable defaultRenderLayer.renderPass ($pass + ".owner");
    			}
    			
    			// create buffer if not existing (every shader will need as many buffer nodes as you have passes!)
    			if (!`objExists ($pass + "_buffer_" + $shader)`)
    			{
    				// buffer will be named "passName_buffer_shaderName" (e.g. "refl_level_buffer_mia_material_x_passes1")
    				$buffer = `mrCreateCustomNode -asUtility "" writeToColorBuffer`;
    				$buffer = `rename $buffer ($pass + "_buffer_" + $shader)`;
    				
    				// connect scene pass to buffer
    				connectAttr -f ($pass + ".message") ($buffer + ".renderPass");
    				
    				// connect shader to buffer
    				connectAttr -f ($shader + "." + $pass) ($buffer + ".color");
    				connectAttr -f ($shader + "." + $pass) ($buffer + ".evaluationPassThrough");
    			}
    		}	
    	}
    }
    RS_createRenderPasses;