A Channel Library sounds great, but it would require a LOT of housekeeping to not become bloated. I struggle all the time with this need however, while this or that big-shot artist twiddles their fingers conspicuously at me. I designed a solution, and it is possible that my little BLOCK BUILDER panel for Axe-Edit could still happen someday. In it, you load blocks from the library or the current preset, then drag and drop channels into a little box. When finished, save the result to the library or current preset. You can even see the settings for the current channel right below. Here's a screen capture:
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