Here is something I worked on recently and that I'm proud of: a "Task Quick Add" modal.
The idea is that you are focused, working on something. Something else may come to your mind. A refactoring you will have to do later. Some unrelated task you will have to do. Or a problem you have to solve first!
With a keyboard shortcut, you are able to invoke a popup modal. You already have the focus on the input, so you can start typing what you need to do. Then you hit "Enter" and it goes to your list of things to do.
That is great if you need to stay focus and quickly capture a random thought. That's also useful if you need to address something first!
The shortcut is configurable. It's working on the Centered Desktop App that I'm working on. You can try it out (it's free): https://www.centered.app/
What do you think?