I'm trying to install a trial version of nFeed plugin to do some testing. However I found this note of JIRA regarding System Plugin
System Plugins
These plugins are integral parts of your JIRA system. They cannot be uninstalled. Disabling or removing them will have serious effects, and may render JIRA inoperable. Do not make changes here unless instructed by Atlassian Support.
So considering this note. If I found nFeed not adequate, I can't disable/remove it since it's a system plugin?