WirHack is a program that makes it easy to apply some hacks to the game War In Russia (WIR.EXE) that I know how to make.  I'm not going to try to explain how to discover these hacks, it would take a small book to explain how to hack a program at the assembly level, this is the reason for WirHack to begin with.  Disclaimer: WirHack comes with no warranty, use at your own risk.

Using WirHack is simple, just place it in the same directory where WIR.EXE is located, and then run it from Windows.  You'll see a small screen with a series of checkboxes, each for a hack that is possible in the game, followed at the end by some boxes with numbers in them.  These boxes allow you to change the replacement multiplier the game uses for German and Soviet replacement squads.  A short description of the options follows:

Partisans:  The partisan activity against Germany is automatic beginning in 1942-43.  This hack disables partisan activity for the entire game.

Attrition:  Attrition is automatic for units in the special HQs, "West Front" and "Italian Front", for Germany.  Each turn units in these HQ's lose some small percentage of their strength.  This hack can disable attrition in one or both of those HQs.

Events:  There are also the special events which are connected to the special HQ's.  These events, such as the surrender of forces in Africa which results in the emptying of the Italian Front, occur based on an internal calculation based on German strength in the Fronts.  These events can be disabled also, for either or both Fronts.

Western Air Forces:  Air forces representing the US begin flying bombing missions against Axis controlled cities in Europe beginning in August, 1942.  One group from N. Africa, and a larger force later on from England.  Either or both of these air groups can be disabled.

Blitzkrieg:  This hack lets you extend the period of blitzkrieg supply the German player gets at the beginning of the Campaign '41 game by one month.

Reinforcements:  This hack can block the automatic use of reinforcements the game uses during the combat phase.  Units from the HQ may be sent to a corps under attack.  You can block this automatic reinforcement for both offensive and defensive attacks.  Some people prefer the game not automatically reinforce, since some people setup their units at full strength and only keep units in the HQ to defend the HQ.

Replacements:  Although the game does use the population in the cities you control to determine squad replacements, it uses a multipler against that total to determine the actual amount, each side gets per turn.  The multipliers are for years and are stored as floating point numbers.  As you can see below, the multipliers change for both sides in certain years.  Germany's multiply increases for 1943 and 1944, and the Soviet's multiplier decreases as the game progresses.  You can freely change these multipliers to any value between 1.00 and 9.99 that you wish.