Still no time to thoroughly test the arena tables but Jaeger and I did a bit tonight.
Preliminary findings for arena tables:
The default tables must be loaded before you can create a new table. No joy if an existing table loads with the terrain or you manually load one.
The feedback dialogs tell you a new table couldn't be created when it did create a table, and in another instance, a table couldn't be deleted when in fact, jaeger deleted the table.