I still believe that giving us more (114 if i remwmber corectly) point to distribue and option to start game with not all points spend ( and discard the rest ofc. )
Would be easiest way to allow us "roll" without needing to implementing the roll itself.
I think starting with all 18s and reducing what you want is fine, but I want to have a legend that lets me know how much my cheating deviates from what the devs consider a "normal" difficulty. Like Narrative (15 Point Buy) = Balanced (27 Point Buy) = Tactician (36 Point Buy) and if you move the points up it perhaps has a color-code that shows you decreased (more green) difficulty and if you move the points down it has increased (more red) difficulty.
I'm not sure why they needed to take away the ability to spend another 3 points to get a 16, 6 points to get a 17, or 10 points to get an 18, like in D&D 3.5. Seems to me the tradeoff is pretty fair.