D5 seems to have an amazing pro asset library.
I would like to suggest some king of sync to Rhino(any software) function in wich some proxies geometries would be created in rhino to represent the assets.
Why it is good?
It would allow more control for asset placement precision and distribution since Rhino has more tools for that. Maybe even use then in grasshopper.
Here is an example of how Enscape deals with it. In Enscape you can either place the proxy in Rhino or in the enscape view and it will automatically create the proxy in rhino(for the second option).
Proxies in Rhino
Assets in Enscape view
Thanks again for the support,
Best regards,
Alexandre