Liaison EMP

I need to add additional stage options to the "Stage" field, but there does not seem to be any way to do so from my end. I logically assumed that this would be editable under the "Core System Values" section in of the EMP Settings page, but alas, that area only houses two permanent fixtures (Entry Year and Student Type)..Could you please have someone contact me to assist with adding additional "Stage" options? Or better yet, can you just add the "Stage" field as a permanent item housed in the "Core System Values" section? Many thanks!