Yes, you can bind something to the other spacebar. Shift, a FN key, backspace, enter, a letter, whatever you want. Normally you would have 8 fingers on the alpha cluster (the letters) and use a thumb for space thus using 9 digits (before someone comes after me for calling thumbs fingers lol). By splitting the space you effectively gain the ability to type with all your digits by giving each thumb a separate key. You can also split the space in more than two keys. Personally I quite like two keys per thumb.