Maybe we should open a new forum just for JCR
On that topic,
In the JCR/alfresco transaction space I found a new place where we need some JCR - alfresco transaction integration. on Session.save() we check for an alfresco transaction which is not present (since a JCR user has no way to open an alfresco transaction).
I know there is a lot of work going on concerning JCR and transactions etc so this may be a mute point.