I recall discussing this in a thread somewhere but I can't seem to find it, Anyway this document
Suggests "DPD200256205 Have -warn unused warn about unused ONLY names" is in the new release. I took this to mean that:
USE FRED, ONLY: bill, alan, peter
would throw a warning if for example alan was not used in the scope of the USE. I was quite looking forward to this feature, did it fall off the list at some point or have I misunderstood?