To a large extent, this is a summary of things I've discussed or read about elsewhere. Here are some things I'd like to see:
1. Limit Pyre Zombie collateral damage so that they can't kill units solely through collateral damage.
2. Provide some additional benefit to Armored Cavalry. Either give an economic benefit (+1

for Hippodromes) or make knights more distinctive (+1 horse affinity, receives defensive bonuses)
3. Re-work the archery branch. I like the idea to improve camp yields along the archery branch. Also, remove resource requirements from tier3/4 archery units, and make bowyers a cheaper tech.
4. On the custom game selection screen, filter the choice of leaders based on the choice of civ.
5. Provide a civilopedia entry for leader traits.
6. Redo the Empyrian religion so that its purpose matches its fluff.
- Lower Chalid's strength.
- Give Luridos a level 3 spell that improves commerce or diplomacy. Maybe something like "Peace Offering: +8 diplomatic relations to all civs with whom you are at war. Bonus removed when peace is achieved"
- Give Empyrean temples a more flavorful economic bonus. Maybe something like "Trade routes for this city are not limited by open borders agreements"
7. I support the suggestion for building pre-requisites when those buildings are practically pre-requisites anyway.
8. Give the Malakim a mechanic that truly distinguishes them from other civs.
- I like the idea that open borders agreements give +2xp to Malakim disciple units.
- I like the idea that each desert tile in the BFC gives +10%

yield
- I really like the idea that the Malakim get the old Patriarch unit, which can call a holy war