http://cfwheels.org/docs/1-1/chapter/form-helpers-and-showing-errors
Text (add in the "Passing Extra Arguments for HTML Attributes" section):

Since ColdFusion cannot have any dashes in argument names we have constructed a work around for you. Let's say you want a "data-dom-cache" HTML attribute, then all you have to do is pass in "data_dom_cache" and Wheels will convert that to "data-dom-cache" in the HTML output for you.

You can also pass in the (perhaps a little prettier) "dataDomCache" instead but then you need to update the global "dataAttributeDelimiter" setting first like this:

set(dataAttributeDelimiter="A-Z")