I think that it would be interesting to integrate this with http://drupal.org/project/userpoints for Drupal 7.
Noticed that you mentioned that this has been converted to a field based approach in D7 but userpoints is not an entity and will likely never be (instead, it will maybe be a field and a userpoints transaction will be an entity).
Is it still possible to do the integration without going over the fields architecture?
Looking for tips, hints, suggestions, we can move the issue to the http://drupal.org/project/userpoints_contrib issue queue once you responded. Thought this is the easiest way to gain your attention :)
Berdir
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