Performance Expression Language: Overall Rating

Summary

Looking to build complex logic around the edit capabilities for performance documents overall rating

Content

Hello-

Currently during our calibration period, we make our performance document's overall rating unavailable via the following expression language (EL) personalization: #{pageFlowScope.pSectionTypeCode != 'OS' ? true  : false

We hide the manager rating component on the overall summary while it is still editable on the goals tile.

We want to add another clause onto this EL statement, that will factor in the security role of the user; so that in the instances we have our global transfers whose rating will not update from our compensation workbook back to the performance document, we can have a small subset of HR administrators that would be able to modify and add the rating when they are the performance document manager. Any recommendations on the appropriate EL to make this work? I've tried calling out specific user names as well as role codes, but have not had any luck getting it to