Ideas Chart: Options to normalize the effort axis

When comparing ideas, I'm interested in relative effort and the resulting quadrant classification. However, almost all of our ideas have effort in the range 5-40, and this puts all of them in the "Maybes" and "Easy Wins" quadrants.

I'd like to be able to:

1. Adjust the displayed effort axis range to be more appropriate to my data,
2. Adjust the divider between "low" and "high" effort areas (which could require a non-linear scaling of the effort values), or
3. Have an option to do (1) automatically based on the full range of effort values.