Hello,
The black background is default, since people complained about "white" flash, which is very disturbing when using dark theme at night.
But looking at the code now, I think I can make it load faster, which could eliminate it completely. I'll try it in the upcoming release.
Good idea with the feature request - I'll add option "Edit dial" to the list of options (if that is what you meant).
Best Regards,
Juraj Mäsiar