Don't think so freenas is build for filesharing web ftp. Linux systems also are free just make sure u have enough bandwidth. Had LFS dedi once running on a VIA Nano U3500 cpu.
It should be possible. All you need is Wine; https://www.ixsystems.com/community/threads/trouble-installing-wine-and-setting-up-steamcmd-in-wine.54330/ No video card or X-window is needed for LFS DCON ( https://www.lfs.net/downloads right top).
Quote from cargame.nl :It should be possible. All you need is Wine; https://www.ixsystems.com/community/threads/trouble-installing-wine-and-setting-up-steamcmd-in-wine.54330/ No video card or X-window is needed for LFS DCON ( https://www.lfs.net/downloads right top). I believe Freenas is mainly build to work true a webinterface and there aren't many setup options so I believe u have to work arround the system for that. So I think he can better use an other small Linux option to run wine.
I link to a topic which was being created on the official forum, what somebody should or should not do is not up to me.