It actually is just a wrapper around setEventEnabled. So it's not "an event", but more like "events". I would like to suggest that you add an eventScriptLabels.txt file to your archive so it will support
EventScript.
percentEventEnabled 1 1
Note that those whitespaces are tabs, not spaces. Copy this and add to the file described and people using EventScript may be happier to use this.
Also, I may recommend using EventScript standard to show how the event is used.
toggle:
onActivate -> Self -> door("Toggle")
onMiniGameReset -> Self -> percentEventEnabled(40, [toggle])
This is just optional, though.