Michael,
Hi. Thanks for your post. This is something on the enhancement list for future releases. Right now the only way you could do this is with a client side event (JavaScript) that would handle this. There are a few example functions out there on the web though, check out this URL or others that showcase JavaScript functions which can create a masked input. We will add this to the list of demonstrations to add in future demos as well.
http://www.xaprb.com/html-input-mas...-mask.html Once you have the JavaScript function you want to work with, you can copy/paste it in the JavaScript File located under module configuration.
-Chad