WebDav Copy for properties

When copying a resource, the WebDav specs recommend to duplicate all properties on the destination resource. I noticed that Owncloud is not doing this (for custom properties). Is there a reason behind this or are there any plans to implement this?

After a successful COPY invocation, all dead properties on the source resource SHOULD be duplicated on the destination resource. Live properties described in this document SHOULD be duplicated as identically behaving live properties at the destination resource, but not necessarily with the same values.

Is there any way I can make the server do this without manually proppatching the properties after each copy request, e.g. by creating an app?