Yes the ability to create more than one feed, named how you like. So, the options I can think of are on the side of the page, which would affect mobile users so you probably don't want to do that. Expanding them as separate buttons at the top, which would affect mobile users AND people who create a ton of them, so probably not a good idea. I think your feed dropdown is a good idea. You'll probably want to make sure that the feed button, when only one feed exists, works the same way as it does right now so that other people aren't impacted by the change, but the only "bad" thing I can think of on my end with a dropdown is that I would have to click twice to get to a new feed. Not a huge deal, and also can be resolved by just bookmarking the feeds. So yeah the drop down feed menu sounds like a good idea.