I discovered today that changing the following will make the submit buttons work as ems measurement:

Down around lines 300-320:

// automatic width setting depending on the number of characters
//$min_width = 80; // this is the minimum button width, change the value as you like
$min_width = 8.0; // 11/8/08 changed to 8.0 for ems measurement
//$character_width = 6.5; // change this value depending on font size!
$character_width = 1; // 11/8/08 changed to 1.0 for ems measurement
// end settings
// added html_entity_decode function to prevent html special chars to be counted as multiple characters (like &amp

then after the above,

if ($width < $min_width) $width = $min_width;
//$style = ' style="width: ' . $width . 'px;"';
$style = ' style="width: ' . $width . 'em;"'; // 11/8/08 changed from px to em

These might get wiped out if the ZC devs create a new html_output.php file.

Thank you, Tom