If you send a vibration to a Skulk Sensor then that one doesn't send on the vibrations to other ones they only get it from the source
Example: If you placed 4 Skulk Sensors 2 blocks away from each other and make a source of vibration 1 block away from the first one, the last sensor won't get the signal, and that was the main part about the sensors and how deadly they are in the deep dark against the Warden.
My Idea:
in the script files for the skulk sensor and the players do something like this:
Skulk Sensor File:
if var Walking Vibrations = 1 then set var Skulk/Warden sense Vibrations to 1
Player File:
if WASD keys pressed and not touching 'minecraft_wool' set var Walking Vibrations to 1
if WASD keys pressed and touching 'minecraft_wool' set var Walking Vibrations to 0

(I used the code type based on Scratch and a little bit of JS.)