So far I've changed the following (patches are not up yet):
//Battle
-) Crater enemies had a general nerf; -30 strength, magic, defence, MDEF in most cases.
-) Goldberry fight reduced to 3x Goldberries instead of 6x.
-) Lot of drain HP attacks removed from end-game bosses; Tyrant, Abyss, some others.
-) All status ignoring attacks were disabled (some may have been missed).
-) The following enemies were adjusted: Satan's Gate, Powersoul Keeper, and Lambda Calcule forms. Attacks were altered, stats adjusted down, and made slower.
-) Gun's formation camera angle was changed
-) Materia bonus/penalties adjusted; more extreme effects were toned down
-) Summons were buffed
-) Armours were adjusted; Warrior Bangle + Fourth Bracelet buffed, slight buffs to other armours like Crystal Bangle
This is just a maintenance patch to adjust some things before going forward. Field script fixes, particularly that dark cave wrong warp problem, are on the way.