Here are some other random customizations that users have requested, so I decided to post them here.

To make the Share form not send an email, or even show any email fields:

javascript:$("#sendEmail").removeAttr("checked")
javascript:$("#sendEmail").parent().parent().hide()
javascript:$("#emailFrom").parent().parent().hide()
javascript:$("#emailTo").parent().parent().hide()
javascript:$("#emailCc").parent().parent().hide()
javascript:$("#emailBcc").parent().parent().hide()
javascript:$("#emailSubject").parent().parent().hide()
javascript:$("#emailBody").parent().parent().hide()