This is loosely related to Tagging - Keyboard Shortcuts
"Secondly, I’ve seen that there are Keyboard Shortcuts for basic things available, but for me there really needs to be Keyboard Shortcuts for tagging so I can click once on ‘Tag Me’ and the rest is via the keyboard - plus automatic movement of the cursor once a box has been filled if possible (rather than pressing Tab)."
As per the link, there is a really heavy dependence on the use of a mouse - which causes significant fatigue - and can lead to RSI etc.
It would be great if the keyboard tab key can be used to move the focus on to the next field or button. Even better if the space bar and/or return key can select the button