1st of all, Nicalou, thank you for having started this thread, I am sorry if it goes further than what you intended.
Jonathan H, thank you for your comments, i think you go too easy by scuffing the ID idea off, calling it is impossible to know. But that is OK. I'll reply on a few specific points you made.
"The problem with your list on what designed life would look like, hoffnung is that it's merely assertions without evidence or solid reason."
I fully agree, I don't see it as a problem though. It is an invitation to research and accept or reject the assertion based upon facts. Obviously I do not have the evidence yet. Otherwise I would have come up wit it.
"Why would a designer leave behind a bunch of traces of trial and error, opposed to leaving only the successful attempts?"
Ever seen a designer where his very 1st model was perfect? I have not. I am not merely looking for extinction and reappeance of a few spieces, I am looking for restarts from zero or almost zero. And even then we have to be cautious, because mass extinction on global scale & restarts of life can have natural environmental causes.
"Why would there be hard boundries as to what life can do rather than a broad range of synthesis, and why are those specific boundries (such as no animals can breathe carbon dioxide) the lines that can't be crossed?"
designers choose options, and this choice makes other options impossible. A car with a diesel engine cannot run on petrol, that kind of stuff. Natural selection does not have a free will to choose. Species are pushed to adapt and develop, taking on as much options as they can, as a reaction upon stochastic elements, if I understand it right. That it thereby crosses boundaries is a very important cornerstone of natural selection.
"The problem with coming up with a list of what designed life would look like is that it infers an understanding of what the designer would do. Which in essence means you can make the theory fit the facts."
I have gone out of my way to not fall into this trap. I might have failed in some points, but I guess I succeeded in others. And again, I don't have all the facts available, so my theory does not fit your assumption, and I cannot make it fot mine either.
"All you have to do is explain why the designer did it this way instead of that way. Are there traces of trial an error? Yes? That's because the designer was working out solutions, he didn't get it right on the first try. No? That's because he's an intelligent designer and didn't leave behind lots of mistakes. Either outcome is explainable by design just by changing the designer. A vague designer is a theory that will fit any fact"
Very true. This list is intended to make the designer less vague and more concrete, without ever really knowing him. If you want to help to narrow it down, add some more items to the list. And again, it is not about WHY, it is about HOW.
"To come up with a solid methodology for prediction, you would first have to make solid predictions about the designer involved. And no ID movement wants to do that."
Well, I must be the very 1st then. I am making solid predictions about the designer.
"But even with the list you made, it doesn't conform to our planet. Ecosystems for instance, are not spontaneous and stable. The planet is in constant flux, the continents are drifting around the planet, it shifts from ice age to thawed age, and back again, and there have been multiple mass extinctions on the planet, as well as a constant background extinction rate. You would have to infer, not a designer that made it and then watched it go, but a designer that is constantly at work, shaping and reshaping the world's ecosystems."
We are well aware no designer is at work in nature at the moment.
"But there again is the rub, either way all you have to do is change the designer to fit the facts. As long as you assume a priori that it was designed then it's easy to explain anything by design. You just have to say that's how the designer wanted and then make up a reason why. Which is really a reverse process"
I don't assume it was a priori designed. By making a list of solid predictions about the designer, I am making it more difficult to make the theory fit the facts.
"It would be more logical to try and understand the nature of said designer by examing the available data, rather than the other way around."
That is exactly what I am trying to do, hence the list. And as you have stated, in order to avoid making facts fitting the theories, you need to have some clear ideas about the designer, so that you cannot renounce it when it does not suit you any more .
It is indeed not easy to find undeniable proofs of design. If it would be easy, somebody would have done it before us. One thing is important in this discussion. It centers around HOW, and not WHY. The why is in the realm of religion and stuff.