Final 3 Greens,
The papis, as I'm sure you are aware, are there to indicate a 3 degree glideslope to the threshold. They are simply a guide for VFR traffic whereas for IFR traffic they are an integral part of an instrument / visual approach. If you want to fly VFR 5-6 degrees on approach that's your perogative, but on an approach that steep you'd find it a bit difficult to land before the displaced threshold; well wouldn't you?
Incidentally, you completely lost me shortly into the 3rd paragraph, I'm just a lowly ATCO with his feet firmly on the ground! I did however do 15 hours training in a C150 as part of my ATC training (solo after 9 hours) and my instructor taught me always to use the PAPIS.
Squibbler
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No, you can't have 09!