I really wanted to modify the save system for my game - I wanted to make a fresh autosave directly before each story choice - but I realized too late that would require learning a new plugin. So I had to settle for just letting the default autosave do its thing.
(Which is not exactly well tested in my project. Don't look too closely at the upper-left corner of some rooms after loading. Sometimes copies of the three protagonists are just... hanging out. In the walls.)