This mod allows you to duping missions like in speedruns! just press ''PAGE UP'' during any mission and you will be set back to the freeroam, but you still in a mission, you can start 2 missions or more at the same time, anyway use as you wish.

Know more about duping here: https://youtu.be/ql4PDGRP5WE

It is for personal use, it is forbidden to use mods in speedruns, in addition it is evident when you have cleo installed in a run.