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Ever since 1.9 came out, I always was used to mouse strafing in PvP, and i enjoyed pvping up until 1.9. What should have been done with the tool cool downs, was adding it as a gamerule. It would have made (in my opinion) 1.9 a much, much better update. Instead of making tool cool downs a permanent thing, you should be able to toggle it on, and off with /gamerule ToolCoolDowns false/true.