llAllowInventoryDrop currently does not allow users (except those who have mode permissions) to drop a script into an object, instead it shouts that they can't do that.
Instead of shouting it could accept the script, but not execute it. Which would be great for script donation boxes (yes i know you can drop an item containing the script in), or allow group members to add a script to an item, which then spreads it to selected(by object name) group obects with llRemoteLoadScriptPIN(). making it easy to update alot of objects with the same script automatically.