This a tiny mod that fixes an oversight in Grand Theft Auto IV where the left shift key always sprints, regardless of whether it's being held or pressed repeatedly, unlike other keys.

This behavior is corrected through mod by making a call to a native function of the game that disables sprinting for a given player, thus it is used when the key is not being pressed repeatedly.

There is also a feature where you can use the caps lock to revert to vanilla behavior, so you won't have hand cramps at the end of the day.

Be aware that this won't work well in case "sticky keys" is enabled in your system. To check if it's enabled, simply hit the shift key a few times to see if a window about "sticky keys" pops up, if it does then follow the instructions in it to disable it.

Source + installation instructions: https://github.com/luluco250/GTAIV_LShiftSprintFix