I would really like to see Charisma get more use. Because its the greatest dump stat until you stack so many feats and class features together that everything runs off of it.
There as a mention by one of the creators that during original pathfinder creation they were going to take an approach similar to 4th where saves were calculated off of the higher of 2 stats.
Reflex was Dex or Int
Fort was Str or Con
Will was Wis or Cha
It has the effect of taking a little power away from dex and raising Charisma a little bit out of being the universal dump stat.
Now i don't know if i'd go so far as 4th and then extend that to past saves (They had classes with Str or Dex to hit, Dex or Int to AC, Con or Cha to Hp, and i think wisdom was in there somehwere). But it would at least make the stat less of a punishment for the charisma classes.