A point buy system, were it costs more points the higher an attribute is increased, isn't really an option unless someone makes me a custom script (either commission or out of generosity). It would be really nice to have though.
I can increase the number of initial attribute points, but then it would only cost 1 attribute point to raise an attribute.
For instance, if I made the starting attribute points to spend be 8, that means the player can make a single stat 18 if they ignore all the others and leave them at 10. I haven't tested it, so I'm not sure if that will wreck the balance or not.