Thanks for your work and willingness to contribute new functionality. The way we handle such thing normally is by discussing them on Apache Servicemix Dev list and then creating appropriate Enhancement Jira at apache and contributing patch there (by attaching to Jira) and soon someone with commit access will review you patch and if it's fine (and not breaking anything) then will be applied to apache servicemix.
Seems everything is already in place:
Concerning the servicemix-samba, Lars has already implemented servicemix-vfs BC. Using Commons VFS, we can support smb/cifs filesystems without problem :