The channel doesn't currently allow you to remove the All Channels row. The "how do you get it back" issue is one of the primary reasons, but also because you'd have to keep adding and removing it every time you installed a new channel. A lot of quirky UI issues with that that I didn't want to try to tackle.
I'd be fine with the All Channels row if it was possible to re-order the rows. Maybe it is and I just haven't found the option yet? If I could bury that one down at the bottom that would be fine. Also, is it possible to rename a row, in case of misspelling?
I love the concept, though. Looks great, works great with the exception of a few already-noted kinks that I'm sure you're working on, and it's a very essential interface addition. I only wish it could fully replace the current home page, but I'm sure that will happen once they inevitably hire you.