To be honest, losing automatic rollout with just 75m RVR would be very scary indeed, especially in the high speed portion of the rollout
That depends how realistic your simulator training is. All you have to do is manually track the localiser beam which keeps you on the centreline. This is easily done by using rudder pedal nose wheel steering. It is useful to know the DME distance of the roll-out end of the runway and use reverse and braking appropriately.