Sneak Tapping

Double Tap Mechanic

This will require 4 objectives:

sneakDetect - stat.sneakTime
sneakTimer - dummy
sneakUseTimer -  dummy
sneakCount - dummy
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/scoreboard players set @a[score_sneakDetect=0] sneakTimer 0
/scoreboard players add @a[score_sneakDetect_min=1] sneakTimer 1
/scoreboard players remove @a[score_sneakDetect_min=1,score_sneakDetect=1] sneakDetect 1
/scoreboard players set @a[score_sneakTimer_min=1,score_sneakTimer=1] sneakUseTimer 8
/scoreboard players remove @a[score_sneakUseTimer_min=1] sneakUseTimer 1
/scoreboard players add @a[score_sneakTimer_min=1,score_sneakTimer=1] sneakCount 1

Here, put any commands you want to be activated by the sneaking. In the target selector, put
@p[score_sneakCount_min=2] plus any other arguments you want. Then:

/scoreboard players set @a[score_sneakCount_min=2] sneakUseTimer 0
/scoreboard players set @a[score_sneakCount_min=2] sneakCount 0
/scoreboard players remove @a[score_sneakDetect_min=2] sneakDetect 1
/scoreboard players set @a[score_sneakUseTimer=0] sneakCount 0

To change the amount of time the player has to activate the sneaking, change the 8 in the first command to any
other number. The higher the number, the more time they have.

To change the amount of times the player needs to sneak in a row, change the 2 in the 7th, 8th, and 9th
commands to whatever number you want. Also, make sure to change it in whatever commands you want
executed as well.