Unchanged Sens

[Lomoda]

Hi, maybe someone knows or already did, how can I make my mouse speed in the game change.For example, I put in the game 4 sens, but when I run and press shift, it changes and becomes slower

 

[Oosmar02]

Exemple (Is algo)
if pressed=ShiftLeft
{
Gamesens = -0.50f
}

if !pressed=ShiftLeft
gamesens();