Mask on input field????

I can not seam to find how to create a true input field mask.  Like creating a Single Line text field and assigning it to telephone number then having the user just have to type the 10 digits for a US number and the dashes are forced.  Example  :510-963-9874 The mask is created as only a validation that the user puts in the dashes not having the field as a true mask.   nnn-nnn-nnnn.

Has anyone figure this out.  Or is this a missing feature since the new forms?

DocuWare Web Client does not automatically add any static characters such as hyphens for phone numbers or SSN's. The user must type the format. DocuWare simply validates the input.

Phil Robson
Senior Director Support Americas