Continuous servo speed control with Arduino Uno controller and servo shield
The speed of your servo is controlled by the pulswidth of a square wave signal. According to the datascheet of the servo the motor stops on a pulsewith of about 1500 µSec (+- 5 µSec). 

From 1500 to 900 μSec the motor turns clock wise. And it getting faster with decreasing pulsewidth. 

From 1500 to 2100 μSec the motor turns counter clock wise. And it getting faster with increasing pulsewidth. 

Next we have to check whether your shield and the library can handle that values and which value you have to give to the servo[i].write(?) function. I can read cyrillic but I do not understand russian good enough to read the f. manual. So I have to look into the code on GitHub (https://github.com/amperka/Multiservo/blob/master/library/Multiservo ).

Et voila: 

Multiservo::attach(int pin, int minPulse, int maxPulse)


You can define the min and max pulseWidth, that's great. Let's do it:

#include &lt;Multiservo.h&gt;   
#define SERVO_COUNT 2     

Multiservo servo[SERVO_COUNT];
// speed is 0 ( full speed CW )
int speed = 0;  

void setup(void)  
{
  for (int i = 0; i &lt; SERVO_COUNT; ++i)  
  {
    servo[i].attach( i, 900, 2100);  
    // 900 - 2100 is mapped from 0 to 180
    // so 90 is the middle where the motor stopps
    // 180 the motor runs as fast as possible CCW
    // 0 the motor runs as fast as possible CW
    servo[i].write( speed );   
  }
}

void loop(void)  
{ 
   // Here I halt the program if the motor stops.
   // If you use a lower value than 89 you can halt the program 
   // at the corresponding speed. If you use a higher value instead of 89
   // the motor starts rotating counter clockwise.
   // Do not use a value greater then 179 or less than 1.
   if ( ++speed &gt; 89 ) speed = 90; 

   servo[1].write( speed );   
   servo[2].write( speed );           

   delay(25);  
}


Ah, of cause I have not hte hardware, so I can not test the program. Use it as an example.