I thinks the current shortcut icons sound great for when the action is performed. Better than during the shortcut binding/unbinding management action.
I suggest the following:
1. play back current bind-item-shortcut1.flac when a shortcut is successfully used to equip or replace an item*
2. play back current clear-item-shortcut1.flac when a shortcut is successfully used to unequip something*
3. use the bind and clear from
http://opengameart.org/content/item-shortcut-sound-pack respectively
4. use error from above pack when a shortcut is used unsuccessfully
* Besides being played back in-game, they could also be played back instead of the current standard menu-progression sound when equipped/unequipped in the menu.
PS: For humanoid screams testing or maybe even final use,
jCRPG's voices in
jClassicRPG/media/audio/sound/ai/humanoid could be used. Some of them seem to be cc-by-sa3, others were sampling+ but are now distributed under cc-by3 on freesound. It's quite a collection to go through though.
PPS: I made
http://opengameart.org/content/wisdom-magic when thinking about what kind of sounds could be played when the obelisks are 'activated' the first time and additional times.