I've had a few requests to remove the dependency on BerkeleyDB.
Starting in 0.6.3 I've added file based persistence code but I have not enabled it yet. It is not tested.
If anybody would like to enable it and test please do. The relevant section is commented out in the method:
Within the next few releases I will make file based persistence the default, and make BerkeleyDB optional. I am not expecting performance difference although there may be some.
I have marked version 0.7.0 for release of this feature.