BeamNg really needs a proper track editor (recorder + replay) ,so we can enjoy more of the crashes and beautifull physics of the engine. I can't believe that there's no still a recorder implemented This should be in the high priority list..
If you have an Nvidia graphics card you could always try to use shadowplay which can record in the background and then you can choose when to actually save the video permanently. I like to have mine set at 5 minutes and then if something really cool happens save it and have it forever.
Beamng should make track/replay editor similiar to "DCS World" has. It automatically records and saves a track and then you can play the track (and take control) afterwards with different camera angles / time speed. This is what i mean and shouldn't be hard to make i quess
It's probably harder than you think to make something like that. I'm sure the devs want to eventually get it in but I doubt it's something that's going to happen anytime soon. They want to finish tuning the driving and the actual gameplay before adding features like that.