Right now it is not possible to add Problem Support Groups (from a custom Enum) to the Console App Tier Mappings App in SCSM, it is possible to select a custom enumeration for MAs though.
It would be nice, if this one could be added, so we could set up Notify Analyst for Problem Records, even when the Support Group AD Group's name is not the same as the Enumeration Name in SCSM.