You can use performance activities to allow others to rate competencies, but at this time it is a bit of a convoluted process.
First, make sure that performance activities are included in the achievement path for the competencies.
Then, create a performance activity that includes a competency review element. You'll have to include a role such as mentor, reviewer, or peer to act as the competency reviewer for the subject, and configure who can choose the competencies.
When the activity is assigned to the subject, the subject (or manager) will pick the reviewers to complete the competency rating, then the selecting participant above will select the competencies for review.
A less ideal workaround would be to assign a shared appraiser login to your group of raters, but I believe that diminishes compliance.
Hope this helps!
