It'd be nice if the difficulty slider adjusted AI to be "smarter" in terms of item, ability, tactics and spell usage for big encounters and not just rule adjustments. If hardcore devs like JE can take down dragons in 2 rounds, I bet he has several ideas how to make crazy party vs party battles. Maybe 'Normal' difficulty on default and a 'JE challenge lulz' setting that pimps up the same encounters.
Btw I admit the powergamer in me loves the Craft Wand feat. My Eldritch Knight's running around casting arcane spells, taking heads off with my scythe and casting Barkskin, Call Lightning etc as needed. Plus Knock and not to mention Cure Disease and Remove Poison wands are cool too. Tasha's H.L. and Gust of Wind wands ain't half bad too. If only Body of the Sun could be a wand...