@Republic of Mercury. Sounds about right, but if that were to happen, no one would mess with the Free cities at all I reckon... Might be nice (for the emperor too!) to have the occasional spat around a Free City, right? Still, I am very happy with there not being consequences,
Maybe. But for me one of the biggest issues is that republics are a limited-resource in the HRE. Once someone annexes a free city, you can still force them to release it, but they'll come out as a monarchy, and be much less likely to re-accept "freedom" which seems a bit odd to me.