In real life, both the Germans and Russians used captured equipment on their former owners, as long as they had the correct supplies, eg shells for 88mm artillery.
This leads to several areas of how will the game use captured equipment, if at all?
1) Will the game use captured tanks as chassis' for self-propelled guns?
2) Will the game use captured guns and re-rifle them, so that their own shells could use that captured artillery piece?
3) Will you be able to use captured supply depot stores, for own use, e.g. fuel/food to keep fighting efficiency high?
I assume the game use supply levels that drop off, further a unit is away from a rail line/supply route. In WIR, you could air-supply out of supply units, but depending on house rules, the unit either had to fight back to it's own lines, or hold out against enemy attacks until their own side could relieve them.
If the following situation arises in WitE, where a Panzer unit, captures a Russian supply depot, but is deep behind enemy lines and not close to a rail hex to supply it. Would a player have to use air-supply, or does the game abstractly use captured supplies to supply a unit, if this situation occured ?