Well, technically BeamNG has something other than T3D, as BeamNG branched off from T3D years ago, today's T3D is quite different from game engine that BeamNG uses, but still some things are compatible and usable too. New things like PBR for example are not something that are in BeamNG while those are in new T3D, then again I have seen PBR in rF2 and I'm not sure if there is so much to it than hype let's you think, it does not look that special, but under the hood it might be nicer. I'm not sure how compatible Terrain Master would be then, depends how much customization BeamNG game engine has compared to 'vanilla' T3D I guess and I'm totally loss at licensing schemes, is something under MIT usable for BeamNG? It is very interesting though and backporting some new stuff from T3D might be faster than developing it from scratch, even BeamNG is doing their own engine at this point, but licensing is always something which can complicate things. I would love to have tiled terrain, but I think it was not on any near term lists or even bit further term lists if I remember correctly?