How to enable "long press vloume botton to trig camera/torch" with qiuck cover closed

My phone got laggy this month and I have moved from G3 stock rom (Android 4.4)to latest RR rom(android 5.1.1)-- with xposed.

I also serach the QCview:
http://forum.xda-developers.com/lg-g...-aosp-t3043744
to my quick cover.

The new rom is so smooth, I feel it even more smooth than my Nexus9 (with stock rom).
And the QCview app also work fine.

Now I just want to recovery the "long press vloume botton to trig camera/torch".
Any possible the let it work?:confused::rolleyes:

(on android 4.4, I use G3 tweak box + xposed troch to let the function work)