Set property mxe.routewfcleanup on install (technote 1690852) - http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=83030
If IBM implement this then it will help prevent unnecessary error messages being created in the logs. This can make reduce disk and CPU usage on the servers and make system administrators lives easier.
IBM development are interested in developing this so additional votes will make it easier for IBM to justify implementing it.
Organisations that implement workflows and don’t want to wait for this to be implemented can follow the steps in the technote - please still vote anyway !!