playwithSix network would work well in this situation. Currently Arma games need to be restarted if you want to edit the list of addons running with the game, so a solution would need to be found to have the addons become available in-game without the restart.

With the recent tweet about Arma 3 getting DirectX12 a case of "not if but when", implementing another API would be a lot easier, the hurdle with be with moving to 2 API's. Adding an OpenGL API would be great, or even, when the time comes, Khronos Group's Vulcan API (New OpenGL). PhysX is already on linux (GPU and CPU, CPU being open sourced recently) so that would not be a hurdle. Arma 3 is my only game that is stopping me from going fully Windows free. Steam is pushing for a Linux gaming backend, and jumping on that would be great. Would love to see a native Arma 3 build. Also, following a linux like methodology, keeping everyone informed on any progress or issues preventing an arma 3 build would be nice, as people would definitely help get it going. Just to be clear i'm not saying to open source the Linux client, just be open about the issues facing the dev team.

helpful links:
DirectX 12 Tweet: https://twitter.com/maruksp/status/580026066183544832
Phyx Open sourced: https://developer.nvidia.com/physx-source-github
Vulkan API steam: https://www.youtube.com/watch?v=EUNMrU8uU5M&feature=youtu.be