Can crews hand-fly an RNP AR approach in IMC?
Each operator can impose their own requirements that are at least as strict as what the FAA requires, and these tend to be more strict.  For instance, one operator I'm familiar with requires both INS's to be working, not just one.

For that operator, it's allowable to hand-fly an RNP approach using the Flight Director if the RNP is 0.3 NM, but if it's any lower then the autopilot must be used.