如何在cakephp中更改'WhoDidiT'的默认行为

I am using 'WhoDidiT' in my model to insert user_id. Its working fine. Now i need to insert a different user_id instead of the logged in user_id. Is there any way to insert the different user_id without modifying 'WhoDidiT'I am using 'WhoDidiT' in my model to insert use