Like making army bonus provided by charisma a little more comparable to bonuses of other SPECIAL?
Ofcourse, charisma does not give you companion for free, and it's in pretty bad state ATM.
But it wouldn't be bad to make stat, generally underpowered with however one exception overpowering whole other stats, a little more in line with others.
There can be quite a lot of ways to achieve this, but let's admit it, one player shouldn't have power of 5 just because he grinds a lot.