No the BF1 has an entirely different problem. The suspension is attached to the car, but the wheels aren't attached to the suspension. But all LFS cars are like that to some degree. It's a feature rather than a bug.
The MRT (and FOX/FO8) were fixed, not that anyone will have noticed having just driven the Sauber.
Yes, but you still need a pushrod that connects from the tip of the lower wishbone to the top of the spring. F1 suspension works the same way.
I suppose it's possible you could have an arm sticking into the car from the crossbar on the upper wishbone (where the wishbone pivots) that would then be connected to the top of the spring (with the bottom connected to the chassis) but I don't know how well that would work. You'd basically have the spring in a spot where you'd want to have the steering linkage.
This only happens in the viewer and is not a bug. I can't recall why it is this way, Scawen told me once. I think it has something to do with the modeller/meshes they use.