Now that I think about it maybe they just need an "awesome bar" for github; put in a sha, branch name, issue, tag, pull request, etc and it can auto-complete and take you there.
Also the network view could be really useful for managing projects if it were much faster and slightly better...
In general I just think that there are way too many similarly sized/colored buttons spread all over the place, so I never know where to look for what I need, and I can't ever quite tell where I am without much work.
I think the mental model of how to view and navigate the repo/network is not transparent or consistent. If they could nail that it would really help a ton.
Jakob Nielsen wrote about that over ten years ago: http://www.useit.com/alertbox/990321.html - I think the gist of his article still holds true.
It's awesome that the URL scheme is 'right' and I can easily use it to get to where I need. But that just means the UI/UX is severely lacking.
For example, I use the bookmark http://www.reddit.com/r/%s with the keyword rdr so that I can just type "rdr programming" into the location bar to go to http://www.reddit.com/r/programming. It has made my browsing a whole lot faster.
div#repo_details { opacity:0.3 !important; } ul.with-details-box { opacity:0.3 !important;}
to make those fade a bit and draw you eye toward the menu bars below them. You could event apply it your specific repo urls, so you could customize it depending on what you're working on.
Again, only a temporary hack, but better than nothing until a better universal design can be agreed upon and implemented.
Stylish: https://addons.mozilla.org/en-US/firefox/addon/stylish/
I understand it's a tough problem domain, but there is definitely room for massive improvement in the UX.