iam to use limesurvey in a voting project
in many cases i will need to verify the person who is taking the vote (the survey)
currently i can use a work around so that a specific signed file should be uploaded through file attachment question type which will be checked during analysis process to verify accepted surveys

now
i believe that integrating digital signature feature or a plugin that can be activated with selected survey to check weather a digital signature token is attached and hence asks for pass key will be a big plus in many usage of lime surveys

for example : this can be just after pressing the submit button of the last page in survey by making a hash or a digital file that represents the survey then signing it with user token and attaching it to the response row in the database with user name and e-mail in the token certificate.