Is it possible to increase supply use and if that supply use is restricted then larger readiness penalties are incurred?
Supply usage is increased because units try to get to 100 readiness, and they do that by burning supplies. There is no way to increase usage (that is practical) which could be used. Among the impractical ways of increasing supply usage would be to run through ALL the SFTs (all some 400+) and adding a slight increase in usage. Of course such a solution would have to programmed very specifically, as there is no way to "read" how many supplies a SFT uses. So one would have to make a table for this. This table would of course need to be remade every time new SFTs are introduced... In other words a pretty big job for something that could be done much more easily by giving a readiness hit.
Regarding the 41 winter. It wouldn't be much of a surprise to the Germans if they knew it was coming, would it? They would be prepared, and perhaps retreat some, slowly to avoid to costly losses. Of course one could make a card, that the Soviets could play, like cpdyoung is suggesting, but making the Soviets the master of weather (on a global scale) would be somewhat magical. The you might argue (like Tom) that local weather effects should not affect troops in local areas. (Ok that is 8 different types of snow, and mud for each kind of Landcape type ie. forests, swamps, etc.) which would be impractical too. You could argue (within reason) that snow in the Soviet Union would be different, and thus only 1 different type of Snow would be needed (along with 1 snow pr. landscape type)... Still that is alot of work, but not undoable. But if we are at the same time suggesting that no readiness hit should occur at all (which Tom is a proponent of) then it would all be for naught.
But yes, I was thinking I could make various levels of preparedness for snow... But... as Tom points out, only a madman like hitler would not be aware of the Soviet winter. Just like only a madman would reduce the Soviet officer corps to its deplorable state it is in, or for that matter the competancy of its forces.