Creating a template for unknown number of signers

Hi,

I am trying to create a template for an unknown number of signers. Currently I create a set number of Participants (say 5), drag and drop 5 signature boxes, and then assign each participant to each signature box. But if I use this template for 6 participants, then it does not work. For a given template, is there a way to have a single signature box, so that any number of participants can sign?