It would be nice if there was an advanced notes system on the map, on logs and quest journal, and a notepad where the player can write what he want.
It's really annoying when you find a random secret place somewhere in the desert, you have no time to visit it and forget where it was. These annotation should be activated or deactivated by quest to avoid an overload of the map annotations or there should be "general notes" which are always visible.
Same thing for advices from NPC for example, if it doesn't log automatically, you write it on a paper (IRL I mean) and you lose it. I often had this kind of problem in RPGs.
Better: possibility to draw on this note.
(I hope I'm clear enough, english is not my native language