Bytecode codegen: The bytecode codegen has not seen significant use and it is not well understood by any of the active developers.

Support for .cm files as input: The ML Basis system provides much better infrastructure for "programming in the very large" than the (very) limited support for CM. The cm2mlb tool (available in the source distribution) can be used to convert CM projects to MLB projects, preserving the CM scoping of module identifiers.