Is there an option where clients can sign the form on a touch device?

Hi,

Thank you for contacting us.

Sure, you can use our E-Signature widget, you will find it here : http://widgets.jotform.com/widget/signature 

Take a look at the guide in order to know how to add a widget to your form : http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form 

Hope this helps.

Regards.