I'd personally love to see a whole parallel set of infrastructure dedicated to the construction of communications networks. This was the era of the communications revolution, and all nations had to make massive investments (public or privately funded) to constuct the infrastructure, yet in V1 that was hardly recognized.
I'd have it break down into the following levels
Telegraph
Electricity
Telephone
Radio Network
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One thing that should be added in Victoria 2 as far as I think is the radio propaganda factor. Countries should be able to establish their radio stations as near to their adversaries land as possible in order to influence their pops against their governments and possibly create rebellions. The radio stations should have a range with respect to the research done in radio technology. For example the first stage could be MW radio tech with which you could only cover an area from UK to Germany, then LW radio tech may allow you to propagate an area from UK to Spain and the third most advanced could be the SW tech which could cover almost half of the world. Also countries could establish their radio stations in their allies' land as well as the land of their vassals.