i think beamNG should look into making a motorcycle or any other fun vehicle even like simple machinery for example to dig with.
Do you mean like the machines/vehicles ROR has? Buses, trains, cranes (and objects), towtrucks, flatbeds, etc...
Telling someone "Mods" doesn't help to much in the "Ideas and suggestions" section . Anyways motorcycles would be tricky, you would have to have training wheels or something and as far as the digger, maybe, but it would be kinda useless without the ground deforming. It would be like banging a shovel into a driveway.
Why? If you think about it, motorcycles steer by weight shifting done by the driver. If you can have a mass, which can move from left to right, that's basically all you need to balance and steer the motorbike. Yes it would be incredibly hard to steer, but that's the most realistic way, you can limit the angle and stabilize the bike upright, though. I know there was boats in RoR. I don't think there is buoyancy in BeamNG (yet), though.
Bicycle physics are everything but binary. The control would have to be quite abstract and uncanny even with gamepads because the analogic part of the analogic sticks are minimal. But I wouldn't mind putting my space navigator to use in a game.
You could always compromise and go for a Motorcycle and sidecar, the most unstable thing ever but hey, best we can do without genius programmers