gorodsb

If still actual…
Insert in wp-custom-field-searn.php (version 0.3.16)this:
line 237 $inputs.="<td><input type='checkbox' ".($values['numeric']?"checked='true'":"")." name='$pref"."[numeric]'/></td>";
and on line 507

class CheckboxField extends Field {
function CheckboxField($options=array(),$params=array()){
CheckboxField::__construct($options,$params);
}
function __construct($params=array()){
parent::__construct($params);
if($params['checkboxoptions']){
$options=array();
$optionPairs = explode(',',$params['checkboxoptions']);
foreach($optionPairs as $option){
list($k,$v) = explode(':',$option);
if(!$v) $v=$k;
$options[$k]=$v;
}
}
$this->options = $options;
}
function getOptions($joiner,$name){
if($this->param('fromDb',!$this->options)){
return $joiner->getAllOptions($name);
} else {
return $this->options;
}
}
function getInput($name,$joiner,$fieldName=null){
if(!$fieldName) $fieldName=$name;
$v = $this->getValue($name);
$id = $this->getHTMLName($name);

$options = '';
foreach($this->getOptions($joiner,$fieldName) as $option=>$label){
$option = htmlspecialchars($option,ENT_QUOTES);
$label = htmlspecialchars($label,ENT_QUOTES);
$checked = ($option==$v)?" checked='true'":"";
$htmlId = "$id-$option";

$options.=" $label";
}
return $options;
}
function getCSSClass(){
return "checkbox";
}
function getConfigForm($id,$values){
return "Checkbox Options";
}
}
class CheckboxFromValues extends CheckboxField {
function CheckboxFromValues($fieldName=null){
CheckboxFromValues::__construct($fieldName);
}

function __construct($fieldName=null,$params){
$params['fromDb'] = true;
parent::__construct($options,$params);
}
function getConfigForm($id,$values){
return "";
}
}
class Comparison {
	function addSQLWhere($field,$value){
		die("Unimplemented function ".__CLASS__.".".__FUNCTION__);
	}
	function describeSearch($value){
		die("Unimplemented function ".__CLASS__.".".__FUNCTION__);
	}
}
class EqualComparison extends Comparison {
	function addSQLWhere($field,$value){
		return "$field = '$value'";
	}
	function describeSearch($value){
		return sprintf(__(' is "%1$s"','wp-custom-fields-search'),$value);
	}
}
class LikeComparison extends Comparison{
	function addSQLWhere($field,$value){
		return $this->getLikeString($field,$value);
	}
	function getLikeString($field,$value){
		return "$field LIKE '%$value%'";
	}
	function describeSearch($value){
		return sprintf(__(' contains "%1$s"','wp-custom-fields-search'),$value);
	}
}

class WordsLikeComparison extends LikeComparison {
	function addSQLWhere($field,$value){
		$words = explode(" ",$value);
		$like = array(1);
		foreach($words as $word){
			$like[] = $this->getLikeString($field,$word);
		}
		return "(".join(" AND ",$like).")";
	}
	function describeSearch($value){
		return sprintf(__(' contains "%1$s"','wp-custom-fields-search'),join('"'.__(" and ",'wp-custom-fields-search').'"',explode(" ",$value)));
	}
}