in portage: 5.9.2, latest avilable: 5.9.4
There are also some plugins that could be added but I am not sure if this ticket is the right place for that.
But if it is I can also add some of them.
Well since there technically there is not maintainer, should really matter if everything is properlly documented? :)
Fixed with 7b2be9c86d3a ("net-vpn/strongswan: bump to 5.9.4")