I certainly don't believe God micromanages every aspect of life, nor have I ever alluded to thinking anything along those lines. So I'm unclear on what you are actually objecting to.
It doesn't matter to the ID movement what your position is. Their position is precisely that God micromanages at the biochemical level (e.g., blood clotting and bacterial flagellae). The majority (if not all) IDists also believe that an omnipotent god is the micromanager so I would take it as obvious that not only minor changes are possible but also something like a fully formed pair of feathered wings
in addition to the other limbs of a quadraped (e.g., Pegasus and angels). To suggest otherwise is to belie what the Discovery Institute appears to be trying to say (not that they are clear or consistent).
Its an argument against the assertion of abundant beneficial mutations, which evolution needs in order to be a viable theory.
Of course, evolutionary processes work precisely because they don't require
abundant beneficial mutations. The process is a hugely wasteful one (half of all things you call human thrown away over and over again) and slowly conserves and accumulates whatever beneficial mutations do appear. They don't need to be "abundant" at all. (of course, who knows what you mean by abundant).
Your question concerning Pegasus has been answered already. You should be embarrassed for not being able to answer it yourself. That is better reaction than getting all upset about being condescended to when you have had the time and considerable effort made by others to help you understand. At this point in time my inclination is to not invest time but rather pat you on the head and send you to the vocational training class.