These so called "userwaypoints" don't set automatically on PlanG map. Every single POI (point of interests like cabins, unlisted airfields, wind farms, lighthouses, dams, masts a.s.o) must be created manually: they must be looked for in the scenery, marked on the PlanG map, additional informations must be written. This way csv files are created. This csv file must be imported manually into PlanG.
Csv files are never part of a scenery file which will install automatically.
On the contrary there is scenery software where an own ADEX file (former AFCAD) is included. This kind of file creates an own airfield sign on PlanG map after rebuilding database.