Add config toggle

src/main/java/ch/njol/skript/SkriptConfig.java

@@ -170,6 +170,12 @@ public static String formatDate(final long timestamp) {
 		}
 	});
 
+	/**
+	 * Determines whether `on <event>` will be triggered by cancelled events or not.
+	 */
+	public static final Option<Boolean> listenCancelledByDefault = new Option<>("listen to cancelled events by default", false)
+			.optional(true);
+
 
 	/**
 	 * Maximum number of digits to display after the period for floats and doubles

src/main/java/ch/njol/skript/lang/SkriptEventInfo.java

@@ -19,6 +19,7 @@
 package ch.njol.skript.lang;
 
 import ch.njol.skript.SkriptAPIException;
+import ch.njol.skript.SkriptConfig;
 import org.bukkit.event.Event;
 import org.bukkit.event.player.PlayerInteractAtEntityEvent;
 import org.eclipse.jdt.annotation.Nullable;
@@ -74,8 +75,8 @@ public SkriptEventInfo(String name, String[] patterns, Class<E> eventClass, Stri
 		// uses the name without 'on ' or '*'
 		this.id = "" + name.toLowerCase(Locale.ENGLISH).replaceAll("[#'\"<>/&]", "").replaceAll("\\s+", "_");
 
-		// default listening behavior should be to listen to uncancelled events
-		this.listeningBehavior = ListeningBehavior.UNCANCELLED;
+		// default listening behavior should be dependent on config setting
+		this.listeningBehavior = SkriptConfig.listenCancelledByDefault.value() ? ListeningBehavior.ANY : ListeningBehavior.UNCANCELLED;
 	}
 
 	/**

src/main/resources/config.sk

@@ -122,6 +122,9 @@ plugin priority: high
 # - effects 'remove ... from drops'/'clear drops': Drops added by other plugins are not removed => increase priority
 #                                                  Skript removes drops it shouldn't => decrease priority or specify which item types to remove
 
+listen to cancelled events by default: false
+# Determines whether `on <event>` will be triggered by all events (true) or only cancelled events (false).
+# The default is false, which maintains traditional Skript behavior.
 
 number accuracy: 2
 # How many digits should be displayed after the dot at maximum when displaying numbers.