All I am going to write down now is speculation, based on 20 years in aviation on different types of airplanes. So my imagination goes this way:
A loaded IL62 would not use the wheel, as the load brings the aircraft in to balance. Otherwise it would simply not be flyable, as the Centre of Gravity would be ways out of permissible range. If the plane is on low load or for ferry flights, they probably need to bring ballast into the forward section of the plane. So the aircraft is basically held in it's balance by the engines rear of the wing and the load, mainly forward of the wing. If the aircraft isn't loaded, it probably could fall on it's tail.
So if they need the aircraft to tow on ground or taxi to maintenance etc. it seems that they need to have this wheel for. However, I think it has to be used carefully for taxi, as the fuselage could otherwise be bended, what is worst, that could happen to an aircraft.
Another aspect for the wheel: The IL62 is a long range aircraft, so taking considerable amounts of fuel. If you choke an aircraft's nose-wheel and the main-wheels or put the breaks on, the aircraft can dis-stress considerably into the chokes during fueling. This can in the extreme be that much, that the chokes get nearly impossible to remove or a risk for damage to the structure is there. So having a wheel is very smart, as the fuselage can dis-stress under the load.
Still, all I wrote now here, is speculation. Maybe somebody familiar with Russian aircrafts can bring in some professional knowledge.