The app has some shortcuts already. You can navigate to the prev/next day using CTRL+ALT+ARROW(LEFT/RIGHT).
With the next update, the buttons that support keyboard shortcuts will display the shortcut in the tooltip when hovering the mouse over it. I will also think about adding a FAQ page that lists all shortcuts.
Can you list the shortcuts you'd like to see added, incl. the expected key combination? I've received something similar for the macOS app here and added those shortcuts to the app recently.
