Now, before everyone starts goong crazy, no, you can't just choose Wis and Con, you still have to keep one strong save and one weak save.
That being said, I was thinking about a new class that would be very customizable, working off the Warlock chassis, the specifics of which haven't well formed in my mind completely. Anyway, one point would be to have each archetype determine what your casting stat is, so, since customization is one of the central points I wanted in the class, what if players could choose their saving throws to better fit a specific build to the class?
The idea is, you choose your archetype at 1st level; one of your save proficiencies must be your casting stat, and then you choose the other. Obviously, you may only have one saving throw amongst Dex, Con and Wis, and must choose the other from Str, Int and Cha. So, if you choose the archetype that gives Wis as a cast stat, you have to choose a weak save, if you cast with Cha or Int, you get to choose a strong save.
What do you guys think?