adding a stop packet

We are using freeradius with mysql. Is there some kind of script to easily add a fake stop date/time to a user when one gets missed? Currently I am looking them up in the accounting table and manually editing the entry. Would like to find something that just takes username as input and creates a stop based on current date/time. We don't use the accounting for anything other than getting usage reports so if a few users are incorrect , no matter. This happens frequently ( several times a week) that we don't get stop packets from our upstream. Then when users attempt a login, simultaneous use check item kicks in and denies them. They claim there is nothing they can do about it. -- Chuck