Thx for this.
Seems to be working ok, but there is error when you look at pictures in album and go back to camera.
edit:
After testing this I tried Camera apk from Xperia Z rom and it seems to work. Didn't receive any error closing album and going back to camera.
Somebody else could try it out and post their experience.
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FOR BETTER XPERIA S EXPERIENCE
Device: Sony Xperia S White
Model number: LT26i
Android version: 4.1.2 leak .200
Kernel: 3.4.0