As I can see from ActiveRecord code this task can not be done with options. Merging of two related tables is done in CActiveRelation::mergeWith (in the framework\db\ar\CActiveRecord.php). And generated criterial are always joined with "AND".
In your case you can use some code like this:
$criteria->join = 'LEFT JOIN `MySketchCloset` t1 ON (t1.`uid`=`User`.`id`)
LEFT JOIN `MyVideoCloset` t2 ON (t2.`uid`=`User`.`id`)';
$criteria->condition = '(t1.whoAdd=82) AND (t2.whoAdd=82)';