Currently only one backing cache can be setup, for all models relying on Django-Cache-Machine.
In a complex application, one would want to choose different cache setup for different models.
E.g.:
model Category (low cardinality, never deleted)
model Article (high cardinality, full CRUD)

For Category one would use LocalMem, with 1 day lease, for Article Memcached, with 5 minutes...