While you're waiting on a kbin app, you should know the mobile site is entirely functional as a mobile app. Just make a shortcut for your home screen
One thing I wish both the desktop and mobile app had was the ability to collapse comment threads. It's handy to just be able to quickly click to collapse a thread at the highest level and move on to the next one. Jerboa has that function for Lemmy, but for some unknown reason they don't allow the user to change comment sorting (eg. top comments). It just forces chronological comment sorting.
Man I wish Relay was available for either Kbin or Lemmy... sigh