Andean fixes:
-Coastal Andean provinces should be drylands in the north and desert in the Atacama desert, then back to plains in Chile
-Lima should not be called Lima, it should be called Chancay and only get a rename if the Spanish show up
-Southern Peru is a hot mess; Camana should be renamed Arequipa, and Arequipa to Tacna
-There should be OPMs in northern Bolivia to simulate the development and wealth of the people of the Beni plains:
http://www.atlantisbolivia.org/beni.htm
-Quero should be renamed Vilcabamba
-Moxos shouldn't be tropical, and needs a border adjustment to be more rounded up north
-There should be an OPM called Nazca in the Nazca province
-Chile and Bolivia should be part of the Peruvian colonial region; La Plata's ahistorically massive as-is and Bolivia/Alto Peru being part of La Plata was a late game administrative decision centered around maximum exploitation for the Spanish crown, in no way reflective of the opinions or attitudes of the local elite which would form a revolting colonial nation in the area
-Chile should be littered in OPMs, Popayan and Cauca should have OPMs. Muisica should be split into two states
General fixes that are actually gameplay affecting:
-Animist religious group shouldn't get affected by religious unity issues unless their religions are reformed
-A convert state from an 'Animist' religion to a different faith shouldn't be smacked around by religious unity; their subjects wouldn't care as historically religious transitions were rarely a case of one day Nahuatl, next day god fearing Christian. Conversion processes were gradual, just look at the Mesoamerican adoption of Christianity
-Southern Africa should have a lot more colonizable provinces as well as a colonial nation region, if a workaround can be found for feeding a colonial nation all of Africa
-Mountains and jungles
NEED to stop being massively expensive to develop. Labeling the Andes as nothing but sheer infertile mountains is so...hilariously inaccurate. Seeing capital provinces like Isfahan and Tabriz being hell to develop is painful. Seeing Java being labeled a bunch of grasslands as a workaround is also painful. Mountains should be no more expensive to develop than hills, and tags based on tropical regions should get a reduction to development costs in jungles. The entire world isn't Europe, prone to drop dead to malaria at any given moment.