OBN, you are getting carried away a bit. We cannot overwrite database waypoints or their stored characteristics. It is possible to create a duplicate but one cannot change a DB waypoint (apart from editing the altitudes and speed once it is in the active flight plan).
Yes, we cannot create a user flyover waypoint (which is a nuisance as it would be handy; have a look at the
YPAD RIKAB 6V visual STAR, which is not in the DB, specifically GLOBE.
It is a simple matter to constrain the aircraft at any waypoint to ALT AT, ALT AT or BELOW or ALT AT or ABOVE. Same with speed restrictions (although I am annoyed you can only nominate a speed AT or BELOW; I would like AT or ABOVE as well!

).
Originally Posted by Halas
The mob l work for has announced all new delivered airframes (and there are a lot of them!) will not have an ADF installed.
Hence forth you may fly a line selectable NDB approach using RNAV.
Just because an airframe isn't fitted with a navaid doesn't necessarily mean that you are automatically authorised to conduct terrestrial approaches with sole reference to LNAV.