I've noticed this too. You can work around it by updating your default sort in settings, save settings, and then close the app. when you reopen the app, your sort will be updated. It's annoying but hopefully will be fixed in 0.37.

Crashes for me if I'm on anything earlier than 0.18

When you edit a comment, does it update to the last edited time?

I don't think there is in list view. Based on the other comments here, if looks like there is a way using different views

Same. If you switch accounts, close the app, and then reopen you'll be on the changed account. Still can't change sort though.

Tap the comment and it will collapse.

I like the option to cycle through pages too, but can also see the reason for not wanting to cycle through all of the low-level pages. Currently there is the back arrow in the upper left that (i think) cycles through the previous pages, and the home button that takes you home. Maybe keep the back button aligned with home and allow for "swipe left to right" to cycle pages so there are 2 ways to navigate both options?