Press a modifier (soon[tm]) key and walk slowly,
press another and walk even slower,
get in and out of vehicles safely (only when standing still)
and you even can do the moonwalk
Mod Homepage: https://forums.factorio.com/viewtopic.php?f=97&t=28279
Credits:
For disabling exoskeleton bonus to 'turtle speed mod' from DedlySpyder
https://mods.factorio.com/mods/DedlySpyder/Turtle_Speed
https://github.com/DedlySpyder/Turtle_Speed
Icon thanks to Waitex https://forums.factorio.com/viewtopic.php?f=96&t=13142
Nasty bug (which caused crashes) fixed thanks to Rseding91 (and Simcra) in #Factorio IRC