The SVT-40 is not in any of the spawn menu's, only as a pickup kit, but the G-41 was used during the Normandy campaign and can be used by some soldiers from the spawn menu. I think that in future Eastern Front maps, the SVT-40 could be a limited kit in the spawn menu, as in 1941, one out of three Russian soldiers had a SVT rifle. Germans also used captured examples, so it may appear in-game as an Easter egg.