For what little my opinion is worth, i personally *hate* the save name prompt on certain renpy games.If someone lets me know how to do this, I'll definitely take a look. Seems like a reasonable ask, just not sure how to do it.
Beyond the annoyance of being prompted for a feature i never use, my chief complaint is that as i play on android only, so often the standard android keyboard's 'enter' and renpy dont play together nicely. As in, you hit enter, and nothing happens. Same thing as when you have to name the PC, or any other text prompt.
So, of you decide to add this feature, i only ask that you do like some devs do and add an actual button near the text prompt that will complete the save process.
Otherwise, enjoy the game!