This isn't possible at the moment, but we're just starting to use a new tool to keep track of this kind of requests: https://1se.canny.io.Please take a look at what we've got there, and if you don't find a similar request you'd like to upvote, post yours so other users can upvote it too.

We’re rolling out our Pro subscription tier as an in-app purchase, keeping our core app 100% the same. No current features will be removed and we guarantee the core app will continue to evolve with new features and updates. With Pro we added royalty-free music and unlimited backups and as a thank you for your additional support we included longer seconds, volume and brightness control, and the ability to remove 1SE branding (the end card). This will allow us to keep 1SE an ad-free system while allowing us to grow and evolve as a distributed company. You'll never have to pay for the app again or purchase a subscription if you don’t feel like it’s something you need. Thanks for your support!

We hope to localize the app very soon! Russian is one of our top priorities. Thanks so much for your patience and support!