Annex More Territory (Marius 2.0)
This mod does what it says on the tin; it allows AI/Player nations to demand (and annex) significantly more provinces in a war situation.
Wars involving Imperial Conquest (new in Marius) now offer even more amounts of land in peace deals (more so than the vanilla variant). Similarly, wars involving the Diadochi/Legacy of Alexander allow for a high transfer of land in a single peace deal, while Independence Wars and Wars involving Claims (whether fabricated or not) allow for similarly substantial territorial changes.
Aggressive conflicts (aka. Superiority Wars or Enforce Access Wars) remain as expensive to demand as before, hopefully preventing either the player or the AI from expanding too easily without a valid Casus Belli.
Updated for Marius (2.0) with some changes; notably, the new "Conquest by the Spear/Imperial Conquest" type has been buffed and further improved upon to allow huge territorial demands (in this mod the province demand in a typical "Claim" conquest is equivalent to the vanilla Imperial Conquest, so buffing it keeps it as a worthwhile research option in the Tech Tree).
Feel free to try it out and let me know your thoughts, whether it needs tweaking, or if any bugs are apparent!