the current openvpn-2.01 ebuild does not give the chance to build openvpn plugins (e.g. openvpn-auth-pam) that are quite desirable over the "script plugins". The feature could be easily enabled with an appropriate use flag.
Created attachment 69011 [details] ebuild with useflag for plugins I created a quick and dirty ebuild with support for building the plugins (currently auth-pam and down-root). Maybe it can be integrated into portage.
Fixed in 2.0.2-r1 BTW, we scan the plugin dir, and build a list from that, excluding README and examples instead of hardcoding a list. Also, we install the plugins to /usr/lib/openvpn