Magento Catalog Search (filter by id)

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I'm writing a custom plugin thing which needs to search the product catalog. Based on some sample code I saw somewhere (possibly this site), I came up with this working prototype:\[code\]$searcher = Mage::getSingleton('catalogsearch/advanced') -> addFilters(array('name' => $_REQUEST['name'])) -> addFilters(array('sku' => $_REQUEST['sku']));$products = $searcher->getProductCollection();\[/code\]This works great for those two fields, but I also need to search by product id. It seems like the proper field to search on is 'entity_id', but its not working:\[code\]$searcher->addFilters(array('entity_id' => $_REQUEST['id']));\[/code\]I've also tried using 'product_id' and simply 'id' with no luck. Keep getting this error:\[quote\] Mage_Core_Exception: You have to specify at least one search term\[/quote\]Any thoughts on how to accomplish this? Maybe I should be using a different class to do my searching?