SUCCESS.
got the field to validate as m M f or F and to auto upshift.
Next (related, but new) question.
If I start to add a record and abort in the middle, how do I get the system to delete that partially completed record without insisting that the field I'm working on at the time is "right" (e.g., if I am in the middle of adding M or F and want to abort, is there a way to abort before/without completing the M/F?)