Editor Toolbar
Press Alt+F10 to navigate to the toolbar. Move to the next and previous toolbar group with tab and shift+tab. Move to the next and previous toolbar button with right arrow or left arrow. Press space or enter to activate the toolbar button.
Editor Dialog
Inside a dialog, press tab to navigate to the next dialog element, press shift+tab to move to the previous dialog element, press enter to submit the dialog, press ESC to cancel the dialog. When a dialog has multiple tabs, the tab list can be reached either with alt+F10 or with tab as part of the dialog tabbing order. With tab list focused, move to the next and previous tab with right and left arrow, respectively.