The "/rollback rollbackarena" command now supports two new arguments, "-ignoreAir" and "-clearEntities"

The IgnoreAir argument will result in it not rolling back blocks that are stored in the file as air.

ClearEntities clears the entities of the region. By default it will not clear: PLAYER, ENDER_CRYSTAL, PAINTING, LEASH_HITCH, or ARMOR_STAND.

Note for devs: I doubt anyone used it, but the prePaste method has been removed.