Solid ideas. Most players only know about the "big green circles" or the most common hidden spots. This would encourage them to go out a little further and explore. Knowing these locations also gives an advantage for Deployed radios as many spots are great for a quick setup or even setting up a command truck since they will now need supply.

Supply stashes would benefit from having more dynamic locations as well. They have not really changed since the game came out. Many towns have significant amounts of supply stashes (Monti as an example has 6) But others will have very few, or their proximity to the objective means they really just act as a bonus supply to the objective (Provins has 2 with one being on the point and the other being within 50m).
You could help players visit some of the more out of the way locations by expanding where supply stashes are located or even changing up where they could be so that experienced players don't always know exactly where to go. This would tie in well to intel and "graffiti marking" as systems.