Allow users to Pin Timeframes to the Sidebar

I've been trying to find an easier way to view my tasks planned for "Someday". Ideally, I would be able to access this as a dedicated tab on the sidebar, but it's now hidden at the back of the upcoming section… Allowing me to rearrange the categories in the Upcoming Overview section would help this a little bit. Ideally, I'd be able to pin any time category to the sidebar for easy access.