Fun, fun update!
Changelog:
– Entering selfie mode is consistent now, a single press is enough to switch.
– You can now take pictures! That doesn’t mean you can preview them, save them, or upload them anywhere (yet? 
). They get stored in C:\Users\%USERNAME%\Documents\Rockstar Games\GTA V\Profiles\[inside one of folders idk which you'll have to guess]
– Changed the input group it’s been using, preventing the camera turning on when input is disabled.
Updated version available in original post.