I just got this game and it's been fun. Now, I have a few questions and need for some tips.
1) What determine which factions lead a siege when many allies are fighting? I often found myself sieging a province only to have an ally come in (often with a smaller force) and then claim control of the province. This is coumpounded by the fact that I have a crapton of allies (see 2).
2) Partly as a result of 1), I've found myself vassaling a lot of other powers rather than claiming provinces, since the provinces that would be useful are usually claimed by my allies and I don't fancy to fragmented a realm. My vassals' list is getting huge: Wales, Leinster, Munster, Hainaut, Fez, Tunis, Algiers, Tripoli and Aquilea. Is there any problem with a "Let's vassal the whole of Europe" strategy? Sure, it brings less cash, but then I don't have to deal with rebels.
3) Speaking of which, any hint on diplo-annex? I need to unify Ireland for a mission, but there seems to be a kind of 10-year waiting period between diplo-annex. Any way to shorten this? Also, diplo-annex push my sliders toward decentralisation, which seems sub-optimal.
4) Speaking of which, any tips with sliders? I'm just not sure what to do, I've been pushing toward centralisation and open-mindedness, but I'm not sure if it's good.
5) Also, due to some earlier mistakes, France got Lothian and the Highlands. Now, I'd very much like to get Lothian, but I'm not sure how to. France is quite the land juggernaut, and invading Lothian, the Highlands and the Baleares (where the Royal Navy prevent reinforcements from coming in) and sinking their navy is not enough to get the warscore high enough, and even with my allies (Brittany, Portugal and Denmark) and vassals getting in, it's not enough to fight their stacks on the French mainland. Worse, my allies keep sending troops in and getting beaten, which lower our warscores (otherwise, I'd just blockade them until their war exhaustion get problematic or something).
Any tips for that?