Thinking back on rolling stats in 6E. I think for me to actually buck the trend of array and/or point buy id need some substantial system changes. A few I can think of;
- Remove initiative and AC increases from Dex
- Remove bonuses to hit and damage from stats and place them into class and/or level progression
- Remove perception from Wis
To facilitate varying stats from rolling id also stop SAD design (which the above changes would help with) and move into MAD. Give each class more options to rely on a different spread. For example; Wizard might penetrate defenses casting spells with a high str, know more spells with high Wis, but could keep more going at once with higher Con. Each stat would have its own pros and cons associated with doing things within the class (but not increasing effectiveness which has shifted to leveling chassis instead).
Saves for each stat works fine, but a reexamination and balancing of the spells is due. There shouldnt be any safe dump stats, nor should spells focus and exploit any above the others.
Just spitballing here.