I know this has been submitted as a feature request at times in the past, such as this thread: https://answers.laserfiche.com/questions/52992/Feature-Request--Forms-91--User-Task-name-to-allow-variables
I know you can add it to the process task name but I don't believe that would be something that could be filtered in the new filter system.
Is there any way to accomplish somehting like this in 10?