Convert Contact to Lead -> Copy Emailaddress

When I’m converting contacts to leads I’d like to copy the whole contact information to the lead form. This works quite well except for email.
I’ve found out that in /include/generic/SugarWdgets/SugarWidgetSubPanelTopButtonQuickCreate.php you can tell Suite to copy contact information by doing:

 $additionalFormFields['note'] = $defines['focus']->note;

However this does not work:

$additionalFormFields['email1'] = $defines['focus']->email1;
$additionalFormFields['emailAddress'] = $defines['focus']->email1;
$additionalFormFields['Leads0emailAddress0'] = $defines['focus']->email1;

which will create a hidden input element:

<input type="hidden" name="email1" value="">

But unfortunately the input will not match the email field. I guess this is because SugarEmailAdress.js being loaded after the form which then resets the email field. Can anyone tell me what I’ve to do to get the email copied?