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.