Non-printable chars in hcmask files ?

Hi there,

I know I can do a rule with things like "$\x0d" to append a special char to a word from a wordlist, but I can't seem to achieve the same thing with hcmask files, e.g. this doesn't seem to do what I was hoping. 

?d?l,\x0d,?1?1?1?1?1?1?2 

where i'd like it to match e,g "fubar\x0d" 

Is there any way to get awkward chars like \x0d, or indeed comma into these charsets? 

thanks,