I think Creo automatically presents the user with suggested names when doing Save-As. It doesn't mean the user has to accept them. Common name is a special parameter and there is no way that it will get turned off. Training users to do this correctly isn't easy. Some are as dumb as a bag of hammers and refuse to pay attention to what they are doing, but it is always up to them as to how the name comes out.
Common Name is used to allow a name that is not subject to limitations on characters that filenames are - can use dashes, extra periods, slashes, and backslashes, parentheses, et al. No doubt it was not easy putting it in there, so there's no chance it is coming out. This was important because Pro/E and Creo are filename-limited and there needed to be a way to deal with parts where the actual name was not suitable as a file name.
