[TRMW]
checkbox_height=calculated number
checkbox_height=n controls the height of the box part of a checkbox control or radio button. Normally these are drawn at a fixed size determined by Windows, no matter what the size of the text of the control. Setting this option allows this size to be over-ridden.
This may be useful on touch screens, for which the default checkbox size is inconveniently small. This setting was introduced into 4.623 in builds dated on or after 7 March 2007.