Dynamically Assigning UserGroups to Participants

I'm trying to solve my issue of assigning all my activities ahead of
time using the ArbitraryExpressionPerformer.
 
Here is what I've done so far:
 
1. Created a process and defined two activities.  Both of these
activities are in the "default" ArbitraryExpression "swimlane"
2. Created two process variables under JAWE's Workflow RelevantData tab
called "pone" and "ptwo" - both are Basic Type - String
3. Under JAWE's activities tab, I assigned pone to be the performer of
activityone and ptwo to be the performer of activitytwo
4. The script type for the package properties is set to text/javascript
5. I changed the Shark.conf file as follows, commenting out the default
and adding the new one:
#AssignmentManagerClassName=org.enhydra.shark.assignment.StandardAssignm
entManager 

 
AssignmentManagerClassName=org.enhydra.shark.assignment.XPDLStraightPart
icipantMappingAssignmentManager

6. I create the process and assign the process variable pone to
"GroupOne" and ptwo to "GroupTwo".
7. I start the process
 
When I look at the assignments for activity one, instead of the users in
GroupOne having access to it, it appears to be assigned to a resource
called 'GroupOne" (even though there is no user called "GroupOne").
 
Is there anyway I can get the ArbitraryExpression performer to assign an
activity to a group instead of a role?
 
Also,
Is there any relationship between a "resource" in the ResourceTable and
a user/group in the Usertable/GroupTable?
 
Thanks 
Greg
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