I have created a feature request thread on Xiaomi's community forum about vibration strenght, if you are interested you can vote for this feature here: https://c.mi.com/thread-3279695-1-0.html
Add me please, my number is +972546218008. Thanks
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I don't think so because Xposed can't run on stock kk.
As far as I know it will work in Xposed 2.5.
I am using Android Revolution HD and I am hgappy with it.