Curve tool enhancements

I would like to be able to easily have a modifier key the when pressed allows you to ‘snap’ your curve points to the linear (unity) line of the curve. So that you can easily keep part if the curve on that neutral line without having to check the numerical readout. Davinchi resolve does this already by using the alt key lock the curve point to the central line.

Also in the RGB curves it would be helpful to be able to see the other colour curves somehow overlaid so you can see the relationships. It would add more prescison.