You need to go to Mojang with this argument. Cubecraft can't put it off. (I think)
Actually they can. There is a plugin that disables it i have it on my server and it works fine! :D^
cubecraft can't turn the delay off it's an 1.9 feature.
You're not the only one who reports this. you can tell it in a e-mail to Mojang.
for now Deal with it and wait before you attack again!