[Calgon]

pawn Код:

if (IsPlayerInAnyVehicle(playerid) && GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
  {
  if (newkeys & KEY_CROUCH)
  {
   if( GetPVarInt( playerid, "Hop" ) >= 1 )
   {
     new Float:xx, Float:xy, Float:xz;
     GetVehicleVelocity(GetPlayerVehicleID(playerid), xx, xy, xz);
     SetVehicleVelocity(GetPlayerVehicleID(playerid), xx, xy, xz + sf);
     return 1;
   }
  }
  }

Then create a command:

pawn Код:

if( GetPVarInt( playerid, "Hop" ) >= 1 )
{
SetPVarInt( playerid, "Hop", 0 );
}
else
{
SetPVarInt( playerid, "Hop", 1 );
}