the Yak7 as fighter was in action in the Battle of Moskau area , according to Gordon&Kazhanov. But VERY few only. And personaly i would say, to include them as flyable would not be worth the effort as the performance difference to a Yak1 was so minor...
MiG3, LaGG3, Yak1, P-40 'Tomahawk' in whatever versions, are already a lot of work in the wanted quality i guess. And than there are still the Polikarpows