Are Avalonia Material's main colors really restricted to the PrimaryColor & SecondaryColor lists? Why?

[buzzware]

I tried to to set colors using a corporate theme, then discovered :

1. MaterialTheme PrimaryColor & SecondaryColor properties are enums with a short list of Material colors. It appears you can't set just any RGB color
2. I can't even use any defined Material color, like
   <themes:MaterialTheme PrimaryColor="Indigo900" SecondaryColor="LightGreen500" />

Is there no override? Is this intentional? What is the reasoning ?

[SKProCH]

Hello.
Currently there is an Advanced Theming wiki page that describes how you can fully customize Material theme: https://github.com/AvaloniaCommunity/Material.Avalonia/wiki/Advanced-Theming