This is a mod for creating, recording, and running macroes. It was originally made to create minecraft TASes.
How it works In the Edit macro panel (By default the "P" Key), you can edit inputs tick by tick :

This saves the macroes to the disk in .minecraft/MPKMod/macros as a CSV file, with the name typed in the field. This allows you to edit externally and share your macroes.
Then, if you press the "O" Key, the inputs will be played in real time. You can now also record your actions (except in GUIs) to create macroes more easily, by default the "I" key.