If xfer worked with wildcards, it only because xfer can take more than one filename as an argument.
the "*" is most likely interpreted by your shell and expanded based on the directory you are sitting in when you run the command - really had nothing to do with filePro.
so - then the question really is - can dxmaint be changed to take more than one filename as an argument (which would have to be exclusive of '-rf' flags) - but while you're at it, i think an easier and more useful one would be to have dxmaint have a new flag to rebuild for all qualifiers for a file (and for that the -rf would still make sense)