Within the Change History of an object, an Operation Reason is noted for operations which include an Approval Workflow.
This is intended to be manually completed by the Requester as a part of the Approval Process.
Object Management activities, which as the Update Activity, can also update the Operation Reason with a hard-coded value.
It is not possible to require an Operation Reason without leveraging an Approval Workflow and manually entering completing the popup which is encountered.
It is possible to leverage PowerShell cmdlets to programmatically approve all pending Approvals for a particular account. If the Approver in an Approval Workflow were called ApprovalServiceAccount, then adding this script into an Automation Workflow and running it on a regular schedule should programmatically clear the pending Approvals approver:
Enhancement request number TF00732876 has been submitted for consideration in a future release of Active Roles.