There is some option for removing various error sounds, but not all.
A lot of players like to spam mash their keys, but the repeated -sound- and error 'that is not ready yet' /cant be done in this area/whilst casting etc. is really annoying. Couldn't it have an option put in to turn it off?
Unfortunately such a habit is ingrained in the brain for many players, since on multiple other games the global cooldown is much faster..