Would like to be able to sort feeds by sources
Interesting. More supporters?
(Of course you could distribute your sources into different topics to have completely separate streams but I know this is not what you are asking)
This is exactly what I was about to suggest. REALLY want this one, personally.
If you can't already, I'd then like each topic's content displayed chronologically, with the newest first. (or the ability to sort each topic's content differently, with that being one of the choices. :)
As a third option alongside the popularity and date options