First off, Britain had its Channel Islands occupied between 1940 and 45. Also Finland lost a large chunk of territory to the Soviets which they haven't got back, Petsamo for example.
TRENCHES: Were used extensively by both the Axis and the Soviets. The war in the East did involve a lot of static warfare, for example the siege of Leningrad lasted some 900 days.
Finns,Romanians,Italians,Spaniards,Hungarians: Yes please to all of the above! Especially the Finns.
Other wishes which i'm sure someone else has mentioned but seeing as this is my first post: German Skijägers! absolute must and would make a very interesting addition to the unit types not only for their mode of transport during winter but for the fact that they had their own special OOB and often received new weapons earlier, for example the Stg44. German Luftwaffe groundtroops, a mistake by the German high command and Goering in particular. German cavalry, Infantry regiments had recce detachments on horse back for example (as i'm sure most here know the German armed forces were,from the begining right up to the end largely horse drawn).
thanks for listening
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"Those who forget history are condemned to repeat it"