Dynomite is a generic Dynamo-layer that supports multiple backends. Dynomite is designed for maximum flexibility which means that configuration is left to the user.
DynomiteDB builds on Dynomite by building backend specific packages. The first DynomiteDB package is Dynomite with a Redis backend. Future releases of DynomiteDB will combine Dynomite with other backends.
In other words, adding opinionated packaging to Dynomite is in conflict with the project's goals, however there is value to an integrated package, thus the need for a separate DynomiteDB repo.
You can view the original discussion on the need to keep a separate packaging repo on GitHub issues