In game sounds and effects
When you typing and execute a quickshop command, you should hear the sounds like typewriter, it can be changed in config.yml.
It's not an important feature, but can have (why not :)).
Anyway, you can disable them if you dislike them.
Configuration
#Special in-game effect
effect:
#Sound related
sound:
#Should we play sound while player trying tab completing?
ontabcomplete: true
#Should we play sound while player executing commands?
oncommand: true
#Should we play sound while player clicking shop container/sign?
onclick: true