You can clone with
If you only want define parent modes, this is easier than making a directory for the .yas-parents file.
BTW, you have ".yas.parents" in the document. I suppose it should be ".yas-parents":http://capitaomorte.github.com/yasnippet/snippet-organization.html
I'll have to analyse this very well, it's not clear for me, for example, when users would be allowed to add parents to a mode. It would almost always need a full reload. Why do you find .yas-parent so bad?
BTW I'm trying to do a complete rewrite of the documentation, as a part of #198, will take care of that there.
Cases I have in mind:
Library author who wants to set parent modes or provide a configuration helper function to do that.
Setup parent modes for mode having non-regular characters such as /.