You can now setup a lead time variability range. This aims to simulate potential issues that can arise during the transportation or production of goods.

In practice, whenever the player sends an order, the delivery lead time will be calculated with a normal distribution around its baseline value +/- the lead time variability parameter.

Together with lead time variability, you can reduce the "visibility limit" parameter to further increase the uncertainty in the deliveries, as the player will not know when the trucks will arrive and which quantity they contain.

Here is how it looks in game:

You can setup both the "Lead time variability" and the "Visibility limit" parameters in the "Lead times" quick update menu of a session settings:

Then: