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THANKS SO MUCH GAMBET! NOW you must read my PM ;P
Also, I put it in my server and found an error. We don't want it at speed 0, so here's a revision:

PHP Code:

//Custom staff boots system
//By: Gambet
//Controls:
//  + and = key (left of backspace on American keyboard) - plus speed
//  - and _ key (left of + and = key on American keyboard) - minus speed
//  z key = toggle on/off
//  Max Speed: 10

//#CLIENTSIDE
function onKeyPressed(code,key)
{
 if (key == "z")
  {
   if (this.staff_boots == "on")
    {
      this.staff_boots = this.speed = "";
      player.chat = "Staff Boots -Off-";
      setTimer(0);
    } else
     {
       this.staff_boots = "on";
       player.chat = "Staff Boots -On-";
       setTimer(0.05);
     }
  }
 if (code == 187)
  {
   if (this.speed+1 <= 10)
    {
     this.speed+=1;
     player.chat = "Speed: " @ this.speed;
    }
  } else if (code == 189)
   {
    if (this.speed-1 >= 1)
     {
      this.speed-=1;
      player.chat = "Speed: " @ this.speed;
     }
   }
}

function onTimeOut()
{
 if (this.staff_boots == "on")
  {
   for (a=0; a<4; a++)
    {
     if (keydown(a))
      {
       switch(a)
        {
          case "0":
           player.y-=this.speed;
           break;
          case "1":
           player.x-=this.speed;
           break;
          case "2":
           player.y+=this.speed;
           break;
          case "3":
           player.x+=this.speed;
           break;
        }
      }
    }
  }
 setTimer(0.05);
} 


But the error with THAT is that it STARTS at speed 0, then you ahve to press + (or = ) before it actualy is USABLE to move around on walls and stuff.