I've found this solution:
Edit your /includes/modules/<template>/attributes.php file. If it doesn't exist, copy the attributes.php file from /includes/modules/attributes.php and put it there.
Once in the file, locate these lines (this started on line 554 for me):
// READONLY
case ($products_options_names->fields['products_options_type'] == PRODUCTS_OPTIONS_TYPE_READONLY):
$options_name[] = $products_options_names->fields['products_options_name'];
$options_menu[] = $tmp_html . "\n";
$options_comment[] = $products_options_names->fields['products_options_comment'];
$options_comment_position[] = ($products_options_names->fields['products_options_comment_position'] == '1' ? '1' : '0');
break;
Comment the lines so it looks like this:
// READONLY
case ($products_options_names->fields['products_options_type'] == PRODUCTS_OPTIONS_TYPE_READONLY):
//$options_name[] = $products_options_names->fields['products_options_name'];
//$options_menu[] = $tmp_html . "\n";
//$options_comment[] = $products_options_names->fields['products_options_comment'];
//$options_comment_position[] = ($products_options_names->fields['products_options_comment_position'] == '1' ? '1' : '0');
break;
Make sure you leave the 'break;' uncommented so the switch statement knows to break.
I left the case uncommented because I personally don't like messing with code I didn't write all too much. While it probably won't hurt to just remove the above portion entirely, I like to just comment out what I don't need so I can just remove the comments if I need it later.