It does require _manual_ save editing. The user would need to add [custom events](https://lua-api.factorio.com/1.0.0/defines.html#defines.events) for this in `control.lua` which is located in the save file. They would be adding a line like so: ```script.on_event(defines.events.on_rocket_launched, function(event) print("A rocket was launched") end)``` I'll test it on my own factorio server soon. Will update this issue accordingly.