While running away from something, let's say a tank, you sometimes need that last extra speed boost. So I suggest a dive move. The character launches himself forward, moving faster than jumping, running, sprinting, but losing a lot of stamina in the process, and ending up prone (or if one still has stamina left, can stand up and move further). Since this is such a stamina-draining move, it would not be abused all the time. Also it should screw up aiming with weapons, so you can't pull off any TheSpecialists-like stunts. How can this be useful? Diving out of the way of a vehicle, since you get a helluva speed boost. Diving out of the way of a grenade. Diving out of enemy fire. Just plain diving to get a little bit closer, end up prone, and be able to set up your HMG.