Feature Request: Border only on and/or alternate color for focused window

[dperson]

IMHO the most useful part of borders is showing focus, adding the same border to all defeats that purpose. I'd like to have the ability to only add the border to the focused window and / or select a different border color for the focused window.

FYI, thanks so much for picking up this project it makes an incredible difference in how cohesive / polished the desktop feels!