It seems like you can assign this action to Ctrl + S, yes. See here:

    Edit → Keyboard Shortcuts → file → Overwrite […]

What Photo app are you referring to? On Debian Trixie, I just get the screenshot app, Spectacle. It shows the screenshot it just took, tells me where it’s been saved, lets me do stuff with it, and lets me take another one. It could do with a facelift, but it’s fairly clear, really. I wonder if they changed it later or if the distribution you used deviated from the defaults.

My reading is they were simply trying to comply with regulations. It wasn't about what ideas they believed the religious texts were trying to convey, but whether their content met a certain definition set by law. The law could be poorly written, or it could be poorly and over-cautiously interpreted by F-Droid maintainers. But I didn't get the feeling they were acting on any kind of moral judgement or own belief about what's appropriate for children.

Does the Bible encourage violence or promiscuity? Not really, no. Does it mention and describe those things in some detail? Yes, absolutely. If that's the kind of content you need to remove from your store, then obviously you need to remove the Bible from your store. Whether that was really the case seems questionable at best, but the stated logic seemed pretty coherent to me.

It’s heavily inspired by both TeX and Emacs, hence why it’s named after both of those. As if the author had added the best aspects of the two and then some.