Changed Bukkit listeners to cancel the event.

src/com/sk89q/worldedit/bukkit/WorldEditBlockListener.java

@@ -65,7 +65,9 @@ public class WorldEditBlockListener extends BlockListener {
                 event.getBlock().getY(), event.getBlock().getZ());
         LocalPlayer player = wrapPlayer(event.getPlayer());
         
-        plugin.controller.handleBlockRightClick(player, pos);
+        if (plugin.controller.handleBlockRightClick(player, pos)) {
+            event.setCancelled(true);
+        }
     }
     
     private BukkitPlayer wrapPlayer(Player player) {

src/com/sk89q/worldedit/bukkit/WorldEditPlayerListener.java

@@ -57,8 +57,10 @@ public class WorldEditPlayerListener extends PlayerListener {
      * @param event Relevant event details
      */
     public void onPlayerCommand(PlayerChatEvent event) {
-        plugin.controller.handleCommand(wrapPlayer(event.getPlayer()),
-                event.getMessage().split(" "));
+        if (plugin.controller.handleCommand(wrapPlayer(event.getPlayer()),
+                event.getMessage().split(" "))) {
+            event.setCancelled(true);
+        }
     }
     
     private BukkitPlayer wrapPlayer(Player player) {