Many of us do that, the favourites tab. I also populate it with multiple module instances using a style.
Many of us, at some time after meeting darktable have had this idea too. The idea crops up on this forum fairly regularly. “Wouldn’t it be nice if we could…”.
But we can’t. Because it is not how darktable works. It may be some time before that day when you first move a module in the pipeline, because you need it to run after some other module, not before. I don’t think I did this for a year or two. When you do, you’ll sympathise more with this:
Pascal is the boss :). We have to live and work with this. I promise you that you will 