B2N,
I politely have a different view to you about approach categories. My understanding is that the pilot should fly the category procedure for the speeds being flown at the particular point in the arrival and approach, they vary during the different segments of the arrival and are speed brackets both in PanOps and TERPS. The categories have a maximum and minimum speed for each category at that point in the approach, you fly the category for the speed you are flying.
The information is available in Jepp etc but can also be found here
Aircraft Approach Categories. The category as determined by the Vref at the time it is flown is used to ascertain the approach minima. The other sector categories must be determined according to the speeds flown at the time because the obstacle clearance is related to turn radius at the speed being flown and also visibility are calculated in accordance to the speed being flown.
MM