Regarding the “cooldown” of global sequential playlists - you can achieve this by instead using parameters and game code. Set up a parameter to play a sound in a single instrument at fixed values such as 1.00, 2.00, etc. (see the Footsteps example in the Examples project). When your player triggers this event instance, have some game code to set the parameter value and then a countdown function to reset the parameter value if it goes over 1 second.
If there will be only one event instance of this event then you can set the multi instrument to Sequential Local Scope. Upon the first hit of the game object, the event instance is created and played. Using a similar countdown function, release the event instance if the time goes over 1 second and create a new event instance.
Regarding the sequential local behavior - when you are using the event editor an event instance is created when played and released when it has stopped. Since the “local” is per event instance, this is why you are seeing the multi instrument play the first entry only as it is creating a new instance each time. You can enable the “Persistent” event macro to keep the event instance alive until “Stop” has been pressed.
I have put a feature request into our task tracker to look into a cooldown feature.