Steam Remote Play Together just released in the Steam beta, if you don't know it allows steam games to natively stream a game to a second player, in theory allowing Beam.NG hot seat to be used as online multiplayer. The only problem is that the feature requires the game to have the "Shared/Split Screen" , "Local Coop" or "Local Multiplayer" features included on the products storefront.
Does not really matter, the current "multiplayer" is almost impossible to play with as long as there is no split screen.