[otrs] Usage of freetext fields in article table

Hi, i need to make time accounting and so reporting with informations stored in otrs. My problem, is to report time by queues et by agent, but when i move tickets from one queue to another i lost the infomation about the queue the time was spent in. Can i use article.freekey and article.freetext to store this information, or somebody have planned to use them in future releases. Regards Jean Marc Deliniere