I have never really understood the rationale of "wizards use Int, clerics use Wis and sorcerers use Cha". So for my new campaign, I am considering getting rid of that rule, and allowing characters to change their casting stat, for example allowing a cleric to swap Wis with Int, or a Wizard to swap Int for Cha.
Obviously, it would be a swap, so all features would exchange. For example, a Cleric swapping Cha and Wis would use Cha for his casting and Wis for his Channel Energy. This would work only for mental stats. And finally, this would apply only to class features
My question is: How would this affect the game?
I am mainly looking for balance issues that I could have overlooked. Bonus credit if you can arrange them as Critical Issues, Major Issues, and Minor Issues. And even though insight for 3.5 can be useful, this is for a totally 100% Pathfinder game.
There were a lot of good answers touching on different points, so I figured I would sum it up a bit here:
- Intelligence might be chosen by everyone, as it gives a better advantage (skill points) than the others (bonus on Will saves for Wisdom, bonus on social skills and spell-like stuff for Charisma).
- Class skill lists might need to be changed.
- It can make some multiclassing concepts more powerful by reducing MAD