Like I said, you're thinking of notification. It will work if you want to control the audio or visual notification of the alerts. It's not for controlling the display of alert icons on the map. The sys.txt settings you posted reflect the settings inside proggy under Settings->Warning->Alert Points->Alert Types->Select Alert Types->"Warning Type" But Gift (and maybe other versions), doesn't provide the option to control visual (hence your modification of it in sys.txt); but I added it to my Gift mod.
See the difference between notification (blue) and icon (red)
Spoiler: .
Bookmarks