So you got the navigation bar hidden? There was another possibility by the way, you could install one of these mods: http://forum.xda-developers.com/showpost.php?p=38637403&postcount=1896. The "No OSB" version removes the Navigation Bar, but let's you keep the Action bar (the "menu" button that looks like 3 vertical dots). It doesn't take screen space, it's one of the Holo guidelines to have such a button, but I think it's more convenient to reach than the physical menu button, and it's just the way Android is supposed to look.
What camera app zip did you try to flash? I'd try one of these: forum.xda-developers.com/showthread.php?t=2101160. That V app should be the same as in this rom if I recall correctly, but it never hurts flashing again. What often helps for those FC's is going to settings\apps\all, scroll to the corresponding app (so camera) and select the option "wipe data" and (if possible) "wipe cache". I'd do that first before trying to flash one of those other apps by the way.
I tried to wipe data and cache but it didn't work out. I'm going to flash the xperia v zip now and report back.
EDIT: Ok it's not working and same goes for xperia nexus v2. However on turbo rom, it is working but it has a wifi bug where it keeps turning on.
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