From the video (I think Tiberius made that video): 
 
	Time Crisis 5\TC5\Engine\Config\BaseInput.ini
 
	 line 37 from Bindings=(Name="MouseX",Command="Count bXAxis | Axis aMouseX") to Bindings=(Name="MouseX",Command="Axis aMouseX Speed=0.05") 
	 line 38 from Bindings=(Name="MouseY",Command="Count bYAxis | Axis aMouseY") to Bindings=(Name="MouseY",Command="Axis aMouseY Speed=0.05")  
	instead of 0.05 and 0.05 I used 0.03 and 0.015 
	for a 16:9 1920x1080 screen