I was of the impression that IDs were already to be treated exclusively oorp ever since this change, seeing as that is the obvious, logical conclusion to come to. If IFFs are now properly locked to faction IDs (with the exception of generic and Wild/intel IDs), then the ID itself is no longer needed inrp to identify a character's affiliation. Likewise, generic/Wild/intel IDs' ability to spoof their IFF only makes sense if they can't immediately be exposed by scanning their ID. So IDs are essentially required to be oorp only.
This could and should be clarified in the server rules with a simple one-liner.
Additionally, IDs could be renamed to something else, since they no longer serve as a means to identify a character. The IFF does this now. Perhaps "ruleset" or "permissions" could be used instead.