@nprofile1q... The UI is good enough for posting on mobile as the sidebar can be hidden. I semi-regularly post from my phone and while awkward, it works ok. I don't plan on creating a dedicated mobile UI.

I haven't considered adding tags to the RSS feed as I've always found them a bit pointless, as they don't link anywhere. What's the value of them? I haven't checked tagging on the RSS spec, so you might be able to link them, I don't know.