Doing "area operators" is possible... it's a matter of changing one group of subscriber's "0" user input key mapping to transfer to another subscriber or call handler. By default 0 is mapped to the "operator call handler" created by setup but you can change this easily.
You can setup templates for subscribers in different "operator areas" that have this already setup and when you make your subscribers you just use the right template. If you've already created your users you can use the BulkEdit utility off my web page to change large groups of them over based on their COS assignment, membership in a distribution list, extension range, pulled in from a CSV etc...
You need to do this for call handlers processing outside calls as well (i.e. if you have audio text applications setup routing calls around). Most folks doing area operator scenarios have call routing rules that dump inbound calls to different opening greeting call handlers (or audio text trees) based on the dialed number or the port hit on the Unity server. If you're only doing DID forward to voice mail then this isn't necessary.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.