The way they did it with clutch and brake is just by locking down one track with brakes. So just pressing right and forward in our setup. Depending on where your center mass is, it should rotate around that spot.
As you want a “proper” neutral turn, I’ll try to setup that experimental monstrosity (with animated engine and gear box) to be able to steer using clutch and brake and then make a version that is steered using gear boxes. I could try using two gearboxes for steering first, as that’s what you need for Tiger, but I have suspicion that we need an open differential for it, which I don’t have yet. So let’s make sure first that Modular Drive Train can be used for old school setup first.
Edit: Otherwise we can always set it up as it’s done on A_Tracked_Vehicle, just with alteration that true neutral turn can be enabled only when tank is standing still, otherwise it’s steered by brakes.
I’ll try to tweak Light Tank’s suspension in a similar way, might get a better result out of it. Was watching some videos of Sherman, Tiger and Hellcat driving on soil, looks like they had very soft and bouncy suspension. T-26 drives like a brick compared to them.