There's only 3 loss scenes implemented at the moment. There are more listed, but they are in need of editing/being rewritten. You can tell if a scene in a production doc has been coded or not by if the text is marked in blue.
Save to file will essentially do the same as save-to-text, but put it into a file and download it. It does have some limitations; it won't work in offline mode due to how the browser sandbox is set up.
What you see is what you get. Check the latest blogpost for FoE for the latest android APK. FoE is not supported natively on IOS or Windows Phone, but you should be able to play it on any platform through a browser (play online option).
The difference is if you stand against Lagon in the last scene in the Pit (where Vena is about to fuck Ophelia), are told to return quickly (with or without the scepter) and dally for longer than a week.
Keep in mind this is something in the far future, so don't be looking for it the next update. There is a lot of designing still to be done before anything will come out of this.
I have nothing against anyone creating such a tool. To my knowledge, no one has as of yet.
It would be appreciated if you put your work up on github tho, when you feel it's in some state of completion :)