I will add that login bar addition to Nathan's site in the near future for those that want a starting point to add their network to the login bar so users can see what sites they only need a single registration upon.
It will not be a supported add-on, as supporting styles for every single site is impossible.
I will help though with any styling issue people have as much as I can, upon Nathan's site where I post it in the next 24hrs or so.