Ahh, it's part of the actual install, so it isn't retroactive / pulled from the instance.

Good enough for now, really only care about it for our Ad Hocs at the moment.

The custom string isn't going into effect for me, though, even after a restart of the instance.

I've tried both "Company representative {0} is accessing your computer." and "{0}" without it kicking in.

Heh, support told me it wasn't a configurable string. Mea culpa.