custom morphs are fine. No problem distributing them as an injection morph.

There are limitations on distributing a cr2 , but those can be overcome using RTEncoder so the original file is needed. 

You may not distribute an obj file that is taken from A Daz figure, but you can distribute a vertex only file which is sufficient to load as a morph target.

There are python scripts available to add morph channels into a cr2 for a custom inj morph .