Custom Tweaks? Any info or guide?

[nixcamic]

I'm interested in setting up some custom Creative Styles on my A7 since it somehow doesn't have any option for that? (Something somehow even my Pentax K5 has...) anyhow, is there any guide for how one goes about finding settings files on the camera and/or modifying them in a safe way? I have some rudimentary Android dev experience and quite a lot of Linux experience (but not embedded, all on server/workstation) so I'm not going into this completely blind, but I'd like to give myself a bit of a head start if possible.