Currently, the game magically generates extra money and manpower out of thin air to provide the bonus for the emperor of the HRE. Rather than relying on such cheats, a better idea would be to implement a money and manpower tax on the members of the HRE, with the proceeds to be transferred to the emperor. The mechanic could be as simple as a variant on war reparations and a manpower malus.
This HRE tax would allow for more in-game flexibility: the amount could change with imperial authority and/or the number of reforms. It would also balance out the advantages for small nations in joining the HRE, as there are currently almost no downsides to doing so. The protection afforded by the HRE should come at a cost.
This HRE tax would allow for more in-game flexibility: the amount could change with imperial authority and/or the number of reforms. It would also balance out the advantages for small nations in joining the HRE, as there are currently almost no downsides to doing so. The protection afforded by the HRE should come at a cost.