As a Load Controller, I held licences for every (foreign) airline we handled, bar our own (AN) as it wasn't required. Even trained overseas for some airlines. I think that we held a certain level of responsibility up to an altitude of 500ft. After that, it was generally not a trim problem, or so I've been told.
When working in Flight Ops, I held a licence for Ground to Air & even had an ARN. In my current role, we're required to attend the same ground schools as the crews, to a certain extent.
There's probably an argument there about 'risk vs reward' but, if CASA were to mandate similar testing to key roles, I'd have no objection.