[ROOT] Whatsapp Trick: How to enable some hidden feature

Hello everyone,
I am writing to share a few tricks that I have found to enable the following functions in Whatsapp:
- Video calls
- Group's invite links
- Two steps authentication in Whatsapp Web.
First of all you need the latest version of WhatsApp Beta (for example, I use the 2.16.213) and a root explorer.
You have to open the root explorer and edit the file com.whatsapp_preferences.xml inside /data/data/com.whatsapp.
You need to add the followings lines inside <map></map>:

Code:

---

<boolean name="group_invites" value="true" />
<boolean name="video_call" value="true" />
<boolean name="video_calling" value="true" />
<boolean name="two_factor_auth" value="true" />

---

Then save and force close Whatsapp from the list of applications on your phone and you are done: you unlockee the hidden features!
I hope this guide has been helpful, and I apologize for my bad English (I'm Italian).
PS: Currently you can only unlock the graphics of video calls, because the servers to which they connect are still down.

Is there any mod or trick to get the 'shooting methods' from front camera to rear?

The front camera shooting methods are really awesome.. especially the palm hand gesture and the heart rate sensor..
Unfortunately they only work for the front camera which is pretty useless for me..

Any way/mod/trick/hack/w.e to get it on the rear camera?