How to assign a task to the user with the least workload from a dynamic user list?

Hi everyone,

I'm working with K2 Five and have the following requirement:

1. A service returns a dynamic list of candidate users, for example: 
   [
     "AUTO\\UserA",
     "AUTO\\UserB",
     "AUTO\\UserC"
   ]

2. The candidate list is different for every workflow instance.

3. Before assigning the task, I need to determine which user currently has the fewest active/open tasks in K2.

4. The task should then be assigned to that user.

I found the SmartObject TaskAllocationRoleMethods and methods such as:

• Get Least Work
• Get Most Work
• Get Round Robin

However, these methods appear to work with a RoleName parameter and not with an ad-hoc list of users returned from a service.

My questions are:

• Is there a standard K2 approach for finding the user with the least workload from a dynamic user list?
• Can TaskAllocationRoleMethods.Get Least Work be used without creating a K2 Role?
• Is it possible to dynamically create/update a role or group at runtime and use it with Get Least Work?
• Is there an API or SmartObject that can return the number of active worklist items for a specific user?
• How have others implemented workload-based task assignment when the candidate users are not known in advance?

Any recommendations or best practices would be greatly appreciated.

Thanks!