Hello,

It would be very handy to get the item or the player's hand to the HangingPlaceEvent as well. Currently there is no way to get the item from the HangingPlaceEvent, because the hand is also unknown.
The item is already known in the method a in the ItemHanging class and would only need to be added to the event.

https://hub.spigotmc.org/javadocs/spigot/org/bukkit/event/hanging/HangingPlaceEvent.html