Some servers may kick you out for sending commands too frequently

The repeating macro does allow you to specify the delay

Thanks~ But this mod seems to only work in the foreground. Can you make it work in the case when I ungrab my cursor?

Do you have pause on lost focus disabled? I believe it's F3+P? If so, there's a possibility that keyboards events no longer get sent to mc when not focused

Thanks a lot~ F3 + P and alt + tab will make it work :)