Dear Spurs Girl,
Thks for the attachment.
Yr list contains a few categories which I personally find rather strange to be listed as PRPs, eg -
Calibration
Traceability
Finished Product Controls
However i agree that the above can be made to fit the SQF definition quoted earlier, ie -
A procedural measure that when implemented reduces the likelihood of a food safety hazard or a food quality threat occurring, but one that may not be directly related to activities taking place during production.
The original PRP concept (eg Codex) was/is, i think, more or less directly focused on maintenance of satisfactory factory hygiene. The primary Codex document makes no mention of the above 3 items. SQF/BRC both reference the Codex principles as the basis for their HACCP systems.
It appears that SQF and BRC have phrased their definitions (use of "may" and "operational" respectively) to include almost any procedures as required.
The ISO list (ISO 22002-1) of prerequisite programs does not include the above 3 items although ISO 22000 could via an appended Note to its "hygienic" definition..
From a purely HACCP POV (which afaik is the reason for using PRPs), the unlimited expansion seems a negative step to me.
I guess you pays yr money and ..... 
Rgds / Charles.C