Custom colors for graphs?

I know that the version of relays graph https://metrics.torproject.org/network.html#versions has been modified to work for color blinds (red/green...).

Is it possible to use custom colors on this graph, at least?

On bad environmental conditions I can't tell them apart properly.

Considering all points (scalability, maintainability, code, other points I overlook) would it be OK to have a) a different color set (pre-defined); or b) custom colors

For b) I mean there's a legend. Fields for RGB values behind them? Sliders? Colormap? (something that doesn't get in my mind?)

(Hopefully no broken sentences due to editing, like in my last reply)