Those functions are in includes/adminfunctions.php, and they're pretty simple. Maybe what you could do is copy one of them and change it to do what you want. print_checkbox_row() puts each one in a div tag, which puts them on separate lines by default. So maybe you could copy that function, put in a loop to go through an array, take out the <div> (or change the display type to inline), and output a <br> tag when you want a new row.
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