Now we're working on second Propel issue with packages and after that we will release next version.
Unfortunately second issue is little more complicated because of several different packages(modules) in one directory. Now ORM Designer handles one directory = one module.
Next problem is external-scheme element:
<external-schema filename="external/author.schema.xml"/>
which is completely out of existing logic. I'm not sure if this would be possible to solve it at all.