[Zope] persistence of unpicklable objects

Is there any easy way to make unpicklable objects created by a python product, persist across product refreshes? When a product is refreshed, it appears that every object the product provides gets re-instantiated - I'm having trouble finding somewhere to stash a reference to the unpicklable object (lists used to communicate with an extra thread holding another object - long story) that doesn't get trashed by a product refresh. KevinL