Maybe like a gamemode that allows you to play with friends that play this game on steam and other stuff that is related to co op modes in games.
There's already a multiplayer mod out for local (same PC) multiplayer. It's not splitscreen, but simply an AI setting where the buttons TFGH act as arrow keys for any vehicles set to that AI. The only drawback is that the main player has to aim the camera toward the second player at all times. I'm not sure where I found this mod, and I've not been able to find it again. If anyone know what I'm talking about, please provide a link.
this mod has never existed like ever no multiplayer mod of any kind has existed for beamng, if it was really so simple the devs themselves would add it
That actually sounds extremely simple, so I would not be surprised if it was real, or at least possible with LUA. The devs would probably not release something so half assed. Edit- When the devs spoke of multiplayer. I'd bet they were thinking of more than 2 people. The problem was it being too bandwidth intensive to sync that much data at once. Maybe a 2 player co op mode that is limited to certain vehicles would be reasonable? Pigeon, Covet, Grand Marshall and D15, since they all seem to have the simplest jbeams. Something is much better than nothing, as time goes on and computers and networks get faster the restrictions could be removed etc.