set_speed(ent,Float:speed,mode=0,const Float:origin[3]={0.0,0.0,0.0})
/*
*
* Sets ent's speed in the direction specified
* by the mode variable
*
* Modes:
* 0 = In direction ent is currently moving
* but not including the z axis
* 1 = In direction ent is currently moving
* 2 = In direction ent is currently looking
* 3 = In direction ent is currently looking
* but not including the z axis
* 4 = In direction of origin[3]
*
*
* Use a negative speed to go in the opposite
* direction of the specified mode.
*
*/