First of all: thank you for this great working and now also better looking tool!
I would like to add a feature, which would help me to manage my feeds even better.
In the list of feeds in options, I can chose to delete all feeds with errors, or feeds with a long time of inactivity. I would like to see a second option, so I can move all this feeds into a selectable category, so I can review them later on: did someone repair the feed? Has the blog become active again?
I am not a programmer (and neither a designer) myself, but maybe others find this idea useful and can help.