It is totally unacceptable to deliberately duck below the glide and by definition ignore the PAPIs and go into the reds just to land short, or to try and make an earlier exit. You either have the required landing distance or you don't.
737fctm state:. The PAPI may be safely used with respect to threshold height, but may result in landing further down the runway
if you go all the way down 2 whites 2 reds, you will land beyond aiming point most of the time. So the point you are targeting 120nm away, the point to where is ending your descent profile may be missed and all your landing calculations a bit useless.
a good landing is on speed, aiming point, centreline, in g factor.
I don t mean that you need to dive 4 reds, i just mean put your aircraft on hte aiming point