A large portion (can't remember the exact number I read in A People's Tragedy I think) of Russia's peasant population (which should represent the vast majority) should be slaves to accurately depict serfdom. Upon the emancipation this would also depict rather accurately the chaos and unstability that followed it, as they become free (with, for example, emigration). Also wish the commune system can be depicted in such a way that it lowers productivity substantially, and drastically reduces the use of new farming inventions. Also how wide-spread poverty was among the Russian peasant class, their move to the cities, and the conflict with non-commune farmers. Stolypin's land reforms to try to establish private ownership in the communes (to dissolve them) would be great, considering there are many decisions already. The Western and Southern areas of the Russian Empire should not, however, have the commune system since it was mainly reserved for the backward Central Agricultural Zone, as the western and southern farming areas were influenced by their capitalist neighbours, and access to their markets.
I think a better export/import feature would be welcome too, to better see what goes to who; then you can plan better than the Tsardom did before the First World War. (When the war broke out they discovered they had only one tanning factory in the whole Empire, as most used to be imported from Germany. This caused large problems equiping soldiers with footwear, and it had to be ordered from the U.S.).
Further think that the Russian peasants should have a rather taste for reaction, as they often were led to it by village elders, kulaks, the Church, the Gentry, and often the state. (Obviously they need to have a taste for social radicalism too).
Oh, and imagine HoI4's equipment system. Seeing you need 2 new artillery pieces in a fort or see that your units have 5 machine guns.. *drool*