Swinging motion on BMW is not allowed just like driving an e30 M3 in the winter isn't. But really I've never see such an option for the BMW. Anyway how would you hook up the swing motion pedal on the e30 or any BMW for that matter without having to weld something here and there. Furthermore, the wire attached to the underneath part of gas pedal would need to be rerouted or a pully system added.
Mad E30 lover