So, I've begun work on a lightly-scripted scenario I call The Fall of Ermor. Its set in between the Early Age and Middle Age, in which Ermor is a dominant empire.
Here's a very early screenshot, everything being a work in progress:
All of the nations (a few of which I haven't added yet) have scripted starts, except Pelagia which I added so I could have everyone else in a single team. ALMOST everyone is on a team against Ermor, but there are two exceptions. Most of the factions will have some kind of new feature. For example Oceania is supposed to be able to recruit all of Pangaea's units except the Pan in this scenario, but my attempt to make that happen didn't work because of the way the modded recruitment commands work (or, more accurately, don't) for underwater nations. I have a plan around that but it will be very tedious.
Anyway, in addition to the scripted starts everyone will come equipped with a full complement of mages and armies. Some of these will be refugee armies from nations that are destroyed. There will also be sites that allow for recruitment from nations otherwise not in the scenario, for example Ermor will be able to recruit auxiliaries from nations that it conquered before the start.
Its very incomplete, I'm only posting this so that I'll be motivated to finish