3Miro
Deity
I like the idea, though it will need much beta testing on its own, but I'd vote for it. Don't forget to add some initial money or mercs.
And what's this about expansion for more mercs? Does the number (and not only type) of available mercs depend on how many provinces I have? (Don't remember reading about this...)
There are about 100 mercs currently in the game. Each merc has a list of potential provinces and in an appropriate time period, a merc has a chance to appear in one province on the list. If they are not hired, mercs will also randomly leave and reappear in another province. The more provinces you control, the more likely you will be to have a merc appear in one of your provinces. You can never hire a merc unless you have a city in at least one of the potential provinces.
We can add one or two Berserker units per Scandinavian province so they will be available only in that province. Thus if you build one city in Denmark, you can hire up to 2 or 3 Berserkers. If you want more, you will need to settle a city in say Norrland and then you can get 1-2 more Berserkers.