Just some ideas:
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Equip all dead soldiers with a Fältuniform 90/ and or make it a unlockable cosmetic (also possibility for something story/mission related since it was introduced during the 80s)
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Customizable safehouses/possibility to upgrade storage box.
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Level progress: Increase the level cap making it possible to earn all/more skills (adjusting so that it takes much longer to do so)
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Cars: (Might be far fetched seing how some roads are blocked (possibly a vespa instead?))
/Mimecrime
Edit: There are cosmetics called Experimental (Pants, Jacket etc.) the Green verison look fairly similar and is pretty much the kind of cosmetic I have been searching for. Anyways it would be cool to see a fully original M90 Camo and also that the dead soldiers laying around the map have them on to make the game more authentic/immersive (I know it is not supposed to be authentic seing as it is highly fictonal. But I think you get my point).