We use AC across the WAN without a problem. If you want to transfer calls, I think you would be safe to assume a maximum of 150ms of delay as with any other call. If you only want to view status, you could probably go higher assuming you're willing to settle for less than real-time status.
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.