"Reject will end the workflow of the instance, and this is the product behaviour. This suggestion is for computed assignee actions. Computed field to define when the item Send's back and to which step. "
On field type User - ability to filter those fields based on Group membership, as in version 2.
When searching for items in many screens, if you click to open the flow item, then click back to go back to your search screen your search strategy is lost.