hmmm actually you have asked a very difficult question
1- main lever 1 2 3 4
2- Low and high shifting
3- Forward and Reverse (Reverse only in low, this is where fauji drivers break the lever... oye aey lagda kyun nai :P)
4- 3 point shifting lever beside the driver seat. 2x4, 4x4 and 4x4 with front and rear diff locks.
5- PTO drive for Winch
6- Hand Brake
there is one more lever on the dash board to cut off fuel and to adjust speed of mog without gas paddle.
Team Unimog always has the Solution!