Don't know how Jepp charts depict NPAs but in my compnay the objective is to fly a constant 3 degree approach path (or the relevant slope). This generally means not levelling at intermediate step altitudes and possibly delaying the final descent beyond the initial approach fix in order to achieve a continous smooth descent through the FAF down to MDA. Training for NPAs is covered in the initial conversion course and recurrent sims, wind limititations are either the aircrafts limits or the (lower) limits of the Captains nerves! Descent rates for all approaches are restricted to less than 3000fpm when descending below MSA+3000, with type specific restrictions on autopilot descent modes to prevent high rates of descent & long engine spool up times close to the ground. Aircraft should be on the stable on the final approach profile by 1000 Radio or a go-around should be considered. If the aircraft is not stable on the profile by 500 radio a go-around is mandatory. On the Airbus we fly the final approach in track/flight path angle mode with the autopilot engaged in bad weather. The 'non-landing' pilot flies the approach with the 'landing pilot' calling out distance to go and height above or below the profile, plus any other pertinent information. The approach is terminated at the MDA if visual contact is not made. It is not permissilbe to fly level at MDA until the Missed Apporach Point is reached.