set ea by script problem

System

I need to set eas on 1600 files but don't know the replicant position for each file. one file may require iweatattr command to set replicantcategory/0/attr=value1

and the next file may need to set the attribute in replicant position 2..... It would be nice for this command line utility to append the attribute to the end of the replicant list. Is this possible?