That's exactly what I'm doing, too (just a little different than you).
Hear, hear...
I only noticed recently that you can actually delete channel presets within the browser while pressing backspace. That's just completely weird as it's the only item you can delete there using a KC (usually, the selected track will be deleted).
The lack of any file organisation (others than "save" and being able to delete channel presets") is not exactly making the thing look particularly hot. Which is quite bad as once you've got your presets done and sorted, it's absolutely excellent to navigate through them. The bare minimum they could do is adding a "show in Finder" option (which exists for other Logic-internal things too, let alone plugins such as Zebra and what not, all having a "show in Finder" option on board). Add some "auto refresh" library function (so files deleted/moved in Finder are automatically deleted/moved in the library as well) and you really wouldn't have to do much on the library itself anymore. Ah well ok, with an ever growing number of presets, a tagging/favourite system would certainly be nice to have.