Myself and coworker both have the same version of Git Tower, when he is focused on an uncommitted change and hits the spacebar, the file is staged for a commit. When I hit the spacebar nothing happens. What's up with that? I like my hot keys! The spacebar checks boxes in my browsers but not in Git Tower. Like I said in the title, this is a "I'm being lazy and don't want to use the mouse, low priority" question.
Thanks
You need to enable Full Keyboard Access
in your Keyboard preference pane, see the image below. Checkboxes (like in Git Tower) are normally not editable/selectable through keyboard focus, so that is why the spacebar also doesn't work.