I don't think the NM-1FECE1B supports CAS signalling. Is this going to Be a T1 between the GW and the PBX? If so, you will need to use an NM-HDV-T124.
With the HDV card, yes we can make the CAS bits whatever we want. Under the voice port, you can use the define-tx-bits and define-rx-bits commands to define what you want for idle ans seize patterns.
CAS bits are not assigned by the country setting unless you have an E1 doing R2 signaling. I would use E&M wink unless the PBX supports PRI, then I would use PRI and get rid of the whole CAS part.