I once assumed that space aliens could even qualify as the "designer" in ID, but apparently not.
I have some fondness for speculating about panspermia, for the idea that life didn't originate on Earth but instead originated somewhere else in the universe and that microbial life was
seeded here. While I rarely imagine that being done intentionally, I can imagine the very early earth being visited by space aliens with dirty boots.
David Brin's multi-volume
Uplift Saga paints a different Science-fiction picture of 'ID'. It imagines a universal civilization, billions of years old, encompassing multiple galaxies, in which earlier intelligent races engineer (or 'uplift') other species to sentience. So every existing intelligent race has an earlier patron race that created it, and that race has an earlier patron race, leading back to the mythical Progenitors billions of years ago, who are imagined everywhere with religious worship and awe.
The appearance of human beings throws that civilization into consternation, since human beings have no known patrons, no known creators. That is considered a heretical idea and is not welcomed. Most of the alien races assume that humans had patrons who abandoned them for some reason, but humans are convinced that they evolved on Earth, making them their own Progenitors. Evolution, like many human ideas, is totally alien to the countless aliens out there, they can't believe it. Another way that humans are different is that we value
creativity, while the thousands of alien races assume that everything that can be known has already been discovered in their billions of years of collective history. While humans conduct scientific research and continue to invent things (however crude by galactic standards), the aliens consult their Libraries filled with scripture-like records containing the accumulated knowledge of billions of years. So the aliens are probably right in considering the new humans to be a disruptive force in their exceedingly static civilization.
It embraces cosmology, as well, not just biology.[1][2]
So... why can't there be different species of 'ID', arguing for different designers who designed different things? Why can't life have one kind of designer (patron races in Brin's universe) while cosmology has a different designer, assuming that cosmology has a designer at all? The whole idea that all the design arguments have to converge on one single Grand Designer seems to be a monotheist assumption built into the design arguments.
But if space aliens did qualify, there would still be the question of their origins, which ID proponents could similarly seize as covered by their criticism of standard scientific views of how life arose / evolved (pointing-out so-called "inadequacies", etc). Smuggling in God even with the extraterrestrials.
The Progenitors.
[1]
"The theory of intelligent design holds that certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection." http://www.discovery.org/id/faqs/#questionsAboutIntelligentDesign
The phrase "certain features of the universe" is ambiguous. It might just mean things like tools and architectural artifacts, it might mean biological organisms and perhaps other systems of similar complexity, or it might mean the laws of physics themselves. I think that 'ID' arguments have been applied to all of them. And again, there's the phrase "
an intelligent cause" which suggests singularity, the idea that one single cause is responsible for all of it. That looks to me to be little more than a theological posit.
[2] William A. Dembski: All the elements in this general scheme for recognizing intelligent agency (that is, choosing, ruling out, and specifying) find their counterpart in the complexity-specification criterion. It follows that this criterion formalizes what we have been doing right along when we recognize intelligent agency. The complexity-specification criterion pinpoints what we need to be looking for when we detect design.
Dembski seems to be suggesting that they already have a "complexity-specification criterion" that "formalizes" and "pinpoints" the criterion that they are using to identify cases of Intelligent Design. I'm exceedingly skeptical and would really like to see it.