product Oracle 10.2.0. 4 on windows 2003 sp2

I have been researching how the resource manager works with
plans,directives,consumer groups etc

The level of detail I am interested in is tying up users to consumer
groups

syntax to add user as follows

dbms_resource_manager.set_initial_consumer_group(' dwh','DW BATCH
USERS');

I was wondering if using detail other than username is an option , in
some cases I would like to segregate users by osuser detail in a
session rather than the username.

I don't expect that this is possible / just raised this as an issue
just in case anyone else has
needed something like this

cheers
Chris B