There has been a shift key bug that has been in every single game that uses that clunky, old, gambryo engine.
Morrowind: Run becomes walk.
Oblivion: Run becomes walk.
Fallout 3: Run becomes walk.
Fallout New vegas: Run becomes walk.
Skyrim: Run becomes walk!
Fallout 4 will have it too. you know it will. and that's just one bug that persists. there are so many more. do you think they will ever get rid of those bugs finally?