Annex More Territory (1.5)
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 the Diadochi/Legacy of Alexander allow for the highest 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.
Tested on Menander (1.5). Feel free to try it out and let me know your thoughts, whether it needs tweaking, or if any bugs are apparent!