Corruption, allowing some people to be corrupt allowing capitalist to force their ideas on the government, although this would piss off the low-middle class.
HOI III Democracy and not just some random political party owning it all, such as allowing a conjoined cabinet. Such as HOS is Fascist but HOG is Republican.
Forcing tariff's on some but not all states.
Able to core things faster then waiting for a random event.
Better CK2 revolts, allowing a early U.S.A civil war/Indian independence.
Maybe a HOI3 province-siege system, aka you don'have to wait for a while, THIS GETS ANNOYING IN LATE GAME.
Dynamic World Wars, aka wars that drag on and kill allot of damn people that truly shows world wars.
Less reactionary revolts when trying to westernize. (I ONCE GOT 3 MILLION PEOPLE REVOLTING AS JAPAN AFTER TAKING MANCHURIA!)
Able to proclaim freedom of religion and IT MATTERS.
Trade that matters.
More complicated pops, it seems a bit simple to me, i mean, i did kinda like looking in my officers tab to see what religion they were, but i allways looked at two pops the most, Farmers,Laborers, and
Factory workers, the NEED SOCIALISM DAMN-IT!
Yeah, that's, about it, unless we want to do something about the German Empire....