I'm getting the error:
ERROR: You must activate this plugin from the network dashboard.
whenever I add a new site in a multisite setup when Proper Network Activation is Network Enabled. It looks like the site still gets created ok, but I wonder what is causing this error? I have lots of plugins installed & network-enabled (and a couple installed but NOT enabled at any level).
Perhaps PNA is trying to 'update' a deactivated plugin, and that's the error?
Not critical, but thought I'd report it. Great plugin and I agree it should be part of Core :)
http://wordpress.org/extend/plugins/proper-network-activation/