You may want to describe what you did so that others can adapt their Kobo.

But yeah, stuff like this should be higher on the priority list for Kobo. It may not be the topmost priority given that they are a business and need to serve their market as best as possible. On the other hand, I can't see how the design of the sleep screen (or the continual redesign of the home screen) is more important than improving the device for people with lower vision.