Smilo you are forgetting decision height.
When flying the ILS which should only be done in visibility that is IFR the appropriate decision height is about 200' above the runway elevation. This decision height is the point at which you do not have the runway in site you execute a missed approach and try again.
Once you have the runway in site you should disengage the auto pilot and land the plane manually.
As a general rule when you see the runway its time to turn otto off. I usually will bend that rule if in a strong cross wind but you still need to get it turned off with enough height to safely land the plane.
You should never let the aircraft fly the whole way to the ground on the ILS especially not in FS. Too often the glide slope will not be lined up properly with the runway.
http://en.wikipedia.org/wiki/Instrument_approach
When in VFR conditions which is about 6.2 miles of visibility you should never need to use the ILS.
Its good to know how to use the ILS but having it land the plane is going to lead to bad results.
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