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The dark mode is already supported: Go to settings > Appearance > Dark Mode

That's a great idea! I look into this in a future update.

You can. Please head to Accounts Manager where you can reorder all posts.

I plan to in a near-future update. Preparations are already on the way to add in folders.

Hopefully in a v5.1.x update.

https://testflight.apple.com/join/KLqwN1Mb

Please make sure you update the posts.

Else please try the beta: https://testflight.apple.com/join/KLqwN1Mb

Version 5.1 is almost complete. Join the pre-beta: https://testflight.apple.com/join/KLqwN1Mb.