Denmark indeed could need a few more provinces---and so could Sweden. Possibly Norway too, but not too knowledgeable on that.
But this change is really great.
I said in another thread earlier today that were I in charge of making Scandinavia and had I free hands I'd add 4 or 5 provinces each to Denmark and Sweden (on top of the ones added in this patch) and possibly a couple to Norway, but again not too knowledgeable on what possibly still is missing there. I'd also have most of the Swedish Norwegian border be wasteland to simulate how armies only could cross in very few places which became choke points.
Anyway for Denmark I'd split the Nordjylland we get in 1.19 in two. One province below Limfjorden, which naturally would be called Midtjylland, and one above Limfjorden. Its name would be harder, but Vendsyssel probably would be the best despite it incorporating Thy too. I'd also but a very thin strip of wasteland on Agger Tange (or make it breached despite it not being so historically) to prevent the unrealistic movement of armies from Vestjylland directly into Vendsyssel.
Then I'd consider Jylland finished to the degree of detail we have in game. I wouldn't do anything to Slesvig, since that historically was one single unit to a large degree.
The remaining 3 or 4 provinces I'd put on the islands. You could argue for splitting Skåne, but historically that was a really important province and it was a unit too, so I'd rather up development considerably for it. The only problem there is that it then would seem to be comparable to places like London and Paris which it wasn't. On the other hand Skåneland and especially Skåne arguably was the most important part of Scandinavia and was the thing pretty singlehandedly deciding who of Denmark and Sweden had the upper hand---the one holding it would be strongest barring some God king.
The way I'd do the islands would be to split Fyn in two; and to separate Hillerød and Copenhagen into separate provinces, like you also did, to show the importance of Sjælland. Then there possibly would be a last province added to the southern isles. Possibly splitting Falster off into its own province so that you had Lolland and Falster both being a province. The reason for that mainly would be to have the islands be more important and stress how you needed to take out the navy or have the seas freeze to really be able to roll over Denmark.
For Sweden I'd add Dalsland (might already be added; can't remember.); I'd also split Stockholm in two and thereby add Upsala (again can't remember if that has happened already). Then I'd add Ångermanland, and split Småland into two or three provinces. The reason for the Småland split was that most Danish Swedish wars centered around the border lands and having those more finely represented would allow for small gains without having Denmark stand in Gøtaland and hence next to Stockholm really fast. If Dalsland is in already I'd probably add a province to Finland; either on the coast or splitting one of the inland eastern ones. If Upsala is in too I'd probably add Øland for more Småland action---or just add one province less.
As mentioned I'd probably add a few to Norway. I'm mainly looking at Trøndelag which possibly should be split due to its significance. Don't know if the northern lands warrants an extra province there. Otherwise possibly splitting Akershus into a northern and a southern province, but I don't know how historical that is. Splitting Jemtland into Jemtland and Herjedalen would be rather straight forward too, so also a possibility. Don't know if Oplandene warrants being split.
As mentioned that's about how I'd do it were I given free reigns on redesigning Scandinavia. With those additions I'd consider Scandinavia pretty much perfect and finished for the level of detail used in game. Sure one could always add 200 provinces and it wouldn't be too hard to find historical basis for that, but that'd make the area way too detailed compared to the rest of the World.
I think 4-5 provinces for each Scandinavian country would be a bit too much, as the population of the region was quite low compared to something like France or Austria, and although I think that Denmark should be much stronger in order to be somewhat realistic, I think that we should be cautious not to make Scandinavia too powerful a region. I think Denmark could use three-four new provinces, Norway perhaps one or two, and I honestly think that Sweden is okay as of now. Perhaps they could use one or two more as well.
I do agree on turning more of Norway into a wasteland, though, as it was a very tough task to actually invade Norway.
How would it make the Sound Toll more likely to be realistic to add Hillerød? Also what would the Copenhagen trade modifier represent?
Though I do agree that in a perfect World Hillerød should be added. And having Kronborg indeed would be immersive; though not sure how it would fare game play wise with how ZOCs work, so perhaps you can expand on that?
Currently the Sound Toll is just a static +20 trade power in the Lübeck trade node, which is a pretty abstract and arbitrary way of portraying it. Instead, if Copenhagen and Hillerød were separate provinces, you could have a Sound Toll modifier in Hillerød - perhaps giving you a percentage of all money that the node produces, and the odd event or two where a passing merchant lies about the worth of his cargo, and the king buys it off him for a small price and thus earns a lot of money. Copenhagen could instead get a "Center of Trade" modifier.
You're probably right about the ZoC thing, though they might've changed it now.
How would you make sure Copenhagen is the last to fall? I agree that it should be the very last to fall realistically, but I just don't see how you can ensure that gameplay wise. And how would it force attackers to dispatch troops for partisan quelling? That's something I don't get. Plus that's probably apply to the entire World or at least most of it and you don't have to leave behind occupation troops there, so not sure how it can be justified adding some snaphane modifier to Denmark---plus even if that's added what's then to prevent the attacker from just having a stack standing to move on revolts or just use harsh treatment?
Make it the last province that they make it to, and perhaps give it an modifier, or some events related to the fortifications or the construction of the citadel.
As for the partisan thing, I admit I might've been a bit unclear - if the Swedes, or any enemy for that matter, don't have Copenhagen, the ZoC will simply revert back all provinces to Danish control. Thus, they will be forced to dispatch a few regiments to keep them occupied, weakening the force that they can use to lay siege with.