Keith ...
To answer the second part your specific question " if hybridized with garden roses could it create a new super hybrid?"
The answer is a yes, it can be used in a cross with other garden roses. HelpMeFind lists 12,518 descendants.
I suggest you do some reading about hybridizing roses as the topic is too complex for this forum. Species roses and garden roses have different chromosome counts which makes the outcome from a cross of a species roses with a garden rose less likely to be successful. However, there have been a lot of studies about how a breeder can develop a new rose using species roses in the lineage.
If you choose to use r. multiflora in your breeding program, Kim's caution about any new rose with r. multiflora in it's lineage being highly susceptible to RRD is something you should consider carefully.
Smiles,
Lyn
