 An important role played by the captain of the fielding side in cricket is deciding where each of your teammates should stand - this affects the bowler's behaviour, how easy it is for the batsman to score runs, how risky certain shots are etc.There is no way of simulating this in armchair cricket, except to say that it falls under the general concept of how aggressively the bowler is bowling.Similarly to how the pitch does not deteriorate in armchair cricket, bowlers do not get tired (although they do benefit from resting during the intervals!