MCDUDE : the original question is : On a CAT I ILS approach, what is the lowest height the A/P can be disconnected with CAT 3 DUAL on FMA?
The answer of flyingstone : 80 feet
"FCOM LIMITATION : ILS CATEGORY 2 : If the flight crew performs an automatic approach without autoland, the autopilot must be disengaged no later than at 80 ft AGL"
Now who is confused ?can' t you read your FCOM ? 80 ft is a limitation only applicable to CAT 2 . Why are you inventing a new non existent limitation?
80 ft is not applicable to CAT 1
If you were keeping the Auto pilot down to 80 feet thats exactly what you would be doing if you asked for a simulated CAT 2 approach.
So again if you are keeping the autopilot down to 80 ft , that's called a simulated CAT 2 and not CAT 1 approach.