Since MB can't record, I don't think that's going to be a problem. And red is certainly associated with 'stop.'
Again:
This is only a quick mock-up to visualize a feature
to be used by skin creators, who will be able to use this feature with their own buttons, colors, positions etc. (or not)This has nothing to do with how current skins will look or function, and they will not be affected.
So even how much I really appreciate the attention and support for the general idea, discussing the looks and colors of this mock-up is of no value.
You could argue this request should have been posted in the skin developers topic and not here, but I thought it might be something that Steven would like to know before releasing v3.0 while development is still in progress.