Well the easiest way to implement would be to make use of the “lead days” setting. That way there would not need to be any new settings - instead, you just base the colors on the lead days for the goal.
So for instance:
Default: Lead Days 4, Blue 2, Orange 1, Red 0
but if you change Lead Days to 6, everything else gets bumped up 2:
Lead Days 6, Blue 4, Orange 3, Red 2
But eventually there could be a detailed color configurer where you could specify which colors the goal would become at which days.
As seen in the quotes, people seem to respond strongly to red, so I think it’s important to allow red to be color-ratcheted.