Epochtalk has a built-in theming engine to modify the colors of various zones of the UI. A dark theme switch was suggested by me long time ago and AFAIK is on the list. Even suggested it again in my first post
here.
Good to hear that.
We don't need anything fancy, just basic alternative dark theme, and maybe make it a bit wider, there is a lot of empty space now.
As for the signatures, they were visible when the demo was announced but were probably disabled to work on fixing the compatibility with the new UI.
They are going to continue working with current signature designs, or we can expect to see support for more modern signatures that can include images.