Html composition on mobile skins can be enabled by setting this config setting in xskin/config.inc.php to true:

$config['allow_mobile_html_composing'] = true;

Html composition will work properly on most newer mobile devices, however, because it's been known to cause problems on some older devices, we've disabled this option by default.

We leave it up to the admins to turn it on with the full understanding that it if any problems were to occur, this issue is beyond our control and we can't fix it.