The value can either be changed in the config or in game with commands.
Works and is compatible with speed potions and every other way sprint speed is effected. Simply works by changing the sprinting speed when the player is moving.
I recommend using values around 1.25 to 1.5
0.5 to half player speed.
The max value is 5 (higher values cause errors), and works with negative numbers.
/vst reload
reloads plugin
/vst set <value>
Set the multiplier, value being a decimal number (1.5 for 1.5x speed, 2 for 2x speed). The max value is 5.