First of all - what i might should have added to the description: You can change the settings for the activation-range (how close to a rail you have to be for the mod to trigger) and train search range (how far away to look for trains) via the mod-settings.
Regarding the "standing still": It should only honk if the trains are really moving, but there seem to be some cases where it doesn't work as intended. One such case is sometimes being trains in manual mode. If you have them on your regular schedule and they still honk. I will try to see if i can arrange for the honking to stop.