Installed, my comments :
1. proximity sensor only brings up the interface, it does not hide it,
which is a bit annoying, but that my personal opinion, and you can just tap elsewhere.
2. While the interface is being displayed, the camera shutter button does NOT work, You need to go back to camera interface and take the shot, in this case, the half press is not intercepted by lFocus, and the manual focus is replaced by auto focus.

Suggestions :
1. Make proximity sensor toggle the UI on/off.
2. Add a checkbox to the left of the manual focus progress bar which will control the functionality of intercepting the half press.
This will allow one to set manual focus, remove the UI to get fullscreen without dimming / blurring - take the shot without auto-focus getting in the way.

Good job mate,
I enjoy doing QA for you.
Eitam.

Edit :
1 more bug, which existed in all versions as far as I remember.
- The hw keyboard shortcuts do not always work on the 1st hit, they sometimes require double click, even if you just toggle red light on off on hw keyboard this happens.