Users should be able to configure views of their upcoming tasks view categories and save them for particularly projects or purposes. Ideally, this would be paired with my other suggested improvement of being able to pin items to the sidebar. Alternatively, you could create a custom views section where you are able to see all of your saved views.

You should be able to do this for calendar configurations as well as Task Date Views. Ideally you'd be able to associate a view with a project so that you could see all attached views when you open a project. Right now, I have many types of configured calendars that have different filters and options selected for my different needs and I have to set these manually each time. The ability to save these would be extremely helpful.