One thing I'd love to see is a flag in GitHub so the news feed won't be filled with repos that I have already starred (so you only get to see new things). This is especially useful as I have starred over 13,000 repos so most repos I will see are starred already.

https://github.com/nikitavoloboev?tab=stars

And before anyone asks 'why star so many repos..', I do it for super fast access of repos I am fond of with https://github.com/lox/alfred-github-jump

Plus you can sort them nicely into categories later. (https://github.com/nikitavoloboev/github-stars)