This has been a much requested feature on the forums since 2009. In the places I have set up WHD, we have set up the approvers section for tickets. A majority of the approvers are technicians who 'live' in the tech interface. Even managers are technicians so they can access the reporting section.
All that is needed is a new tab called Approvers where the tickets that need approving can be shown. The technician than just click on the ticket, read the information and then click approve / deny with a note. I know we have client approvals and email approvals, but if we are telling 100 techs to live in the 'Tech' interface then they shouldn't need to logout to go to the client or use email to approve.
Implemented in WHD Version 12.5