It is possible to open up the Create Todo Popup by typing T (Shift+T).

Create Todo Popup

While adding Todo's, you can use keyboard shortcuts in the input field. When a keyboard shortcut is typed in, a shortcut dialog will appear. Choices can be selected by navigating with the arrow keys to the different options and pressing enter. Pressing esc will remove the shortcut dialog.

Shortcut	Description
/t	Shows all tags. Type to filter out tags or create a new.
/r	Shows all quick picks for reminders.
/d	Shows all quick picks for deadlines.
/f	Shows an option to mark Todo as in FOCUS
/c	Shows an option to clear the add field

Example of tagging using the keyboard shortcuts.

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