Toward a Scientific ID

As a thought experiment, let's reject evolution, accept the theory of intelligent design as commonly formulated and really consider the implications. Here are a few of my thoughts below.

Strictly Decreasing Bio-Diversity:
If you throw out macro-evolution, there is no mechanism by which new species can arise. Barring repeat and future visits by our intelligent designer, this means that biodiversity on the Earth will always be decreasing and has been decreasing for all of history. This would have pretty serious implications for environmental politics. It would also turn paleontology on its head, as it would necessitate considering all modern animals as participants in prehistoric ecosystems.

Similarity of Organisms
Many organisms are similar in structure to one another, and there seem to be familial relationships in certain groups. This is naturally explained in the theory of evolution, but what what explanation for this exists in the theory of intelligent design? Could the creator have been working using templates of some kind? It seems to imply that the creator faced some kind of constraints on design time.

Motivations / Extra-Terrestrial Life
If you accept the notion of an intelligent creator, its natural to speculate about their motivations. I know that some people in the ID community already have a storyline in mind, but there is no reason the rest of us can't speculate more adventurously. If the creator saw fit to create life here, could the same motivations have led them to create life on other worlds? As discussed above, the creator my have had limited design resources, so could this life be similar to ours?

Creative Inspiration
Where did the creator draw inspiration for their designs? If our creator's design resources were limited, might they have been working from existing archetypes? If the creator was biological, could these archetypes been creatures on the creators own world?

Relative Intellect
Was our creator more intelligent than us? If so, why did they choose to limit our intellect? Were they incapable of producing beings intelligent as themselves? This seems unlikely to me, but to do so deliberately seems oddly nefarious to me. If we are as intelligent as they are, might we someday develop the ability to design life?

Regression of Causes
If the evidence demands we have an intelligent creator, then it probably demands our creator has an intelligent creator as well. And that that creator has an intelligent creator, ad infinitum. An infinite regression of prior causes is unpalatable to many people , so what is to be done?