The NCM desktop application is going to be deprecated soon. The reasons are discussed on multiple places on thwack and I'm ready to defend them any time. That's why we decided to only support multi-poller environment on web. Then it doesn't really matter whether you have 2 or 10 additional pollers.
I'm also curious about the security argument; actually, not having to grant access to NCM server is one of the most important and frequent requirements in favor of the Web UI. We can discuss the details offline.
Please let me know if your experience with our support is not satisfactory.
Jiri