To prevent abuse, GMs should be permission restricted (via GM level) to trade with other non GM players, use their storage (prevent transferring to their other characters), send via Duey and to drop items. GM level is configurable.

config.yaml

@@ -461,6 +461,12 @@ server:
     #Event End Timestamp
     EVENT_END_TIMESTAMP: 1428897600000
 
+    # GM Security Configuration
+    MINIMUM_GM_LEVEL_TO_TRADE: 4
+    MINIMUM_GM_LEVEL_TO_USE_STORAGE: 4
+    MINIMUM_GM_LEVEL_TO_USE_DUEY: 4
+    MINIMUM_GM_LEVEL_TO_DROP: 4
+
     #Any NPC ids that should search for a js override script (useful if they already have wz entries since otherwise they're ignored).
     NPCS_SCRIPTABLE:
       #9200000: Talk to Cody # Cody