Set taxonomy default when importing with the feeds module?

The feeds module: http://drupal.org/project/feeds

When it imports a node, what if the default taxonomy was set?

API: http://drupal.org/node/622700

As I understand, you could use the mymodule_feeds_node_processor_targets_alter hook to add a taxonomy mapper and
the mymodule_set_target callback function in it to set the taxonomy default.
What do you think?