My two 2023 requests.
1.) When you go to previous channel, the channel you leave, begins to record in the background. When you return to it, you can rewind to the spot you left. If you pause it, when you return to it by pressing previous channel, it is still paused at the spot where you left it. TiVo will do this simultaneously on every tuner.
2.) Page up/down shortcut works for On Now and Library, like it does for Guide.