When a user first installs the proxy they might not know which features they want to have enabled. Once they realize that they need the puppet (or CA, DHCP, DNS, etc) feature enabled, they enable it and restart the proxy. Even after that's done, it's unclear how to get the new features into the proxy.

Users have to re-save the proxy to get an updated list of features. A simple button to get the feature listing from the proxy again would probably reduce this confusion.