How is a 5x20 button going to help as far as auto-leveling is concerned ? That features would just be an automated way of pressing the 20 button 5 times if possible. If there's not enough stamina/energy/honor, the 5x20 button wouldn't work, if the player level up in the middle of it, it stops. Each hit removes whatever stat is being used and add xp so the next hit can't be free or add more xp over a level.
They won't add it, but not for this illogical reason.
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