Obviously, the gearbox / clutch / manual / sequential / electronic-aids, etc., is already very complex to model in order to cover the various systems across all content, not to mention future stuff. If we consider what iRacing and RaceRoom have done with their drivetrain models, it's proven very effective in providing more realism / immersion through both some subtle and not so subtle ways. We should also keep in mind though, much of the drive-train physics modeling has to include audio-system integration, another tricky aspect in itself all the while, considering additional effects such as drive-train oscillation, environmental effects, and much more. Obviously, this is no small task to be done but, it is an essential one in any serious racing-simulation imo. I hope it remains a subject of discussion and consideration by the dev's, and not just S397. I'm surprised Kunos hasn't developed their drive-train physics system further but, perhaps they too, have long term plans that include such things.