Tapping the toggle sprint key once will initiate sprint normally, tapping a second time will start fast run. Tapping a third time will do nothing.
Basically the mod needs to check if the player is already sprinting, and allow to press the Sprint toggle key again to activate fast run. Minecraft Vanilla does nothing when pressing this key a second time mid sprinting.
Tapping the toggle sprint key once will initiate sprint normally, tapping a second time will start fast run. Tapping a third time will do nothing.
Basically the mod needs to check if the player is already sprinting, and allow to press the Sprint toggle key again to activate fast run. Minecraft Vanilla does nothing when pressing this key a second time mid sprinting.