Comment 6 for bug 1215262

I'm not entirely certain the graphical representation you are seeing is due to any limitation in Network Manager. While I agree there should be a disconnect all option for VPNs, I'm able to see and select multiple VPNs to connect to in the UI, and in some cases I would NOT like to have it force disconnect one connection to connect to another. What you may be seeing is a common issue where if you don't specify the name of the adapter to use (defaults to 'tun') then it trips over itself reusing the same name over and over for each connection. Simply changing the device name (it will create it when necessary as long as you have enough permissions) will allow you to have multiple connections and activate them at the same time.