ID3 metadata

When exporting an audio mixdown, and typically for the second or multiple times, I have to reenter the detail (Cubase does not remember the originally ID3 info entered). It always carries the metadata entered on the last exported song. Is there a setting that could remedy this or is that the way it is.

Also, in the metadata pulldown for genre there are only a limited number of categories of music styles. There does not appear to be a way of adding missing genre.

If nothing can be done personally to achieve the above, should I put in a ticket to address it.

Is there any one out there that has some thought on this item. Thanks