We enabled codes for auxiliaries because we couldn't figure out where all the paper was going. 90% Seminary usage, we found that pretty quick - so it was helpful in that respect. The other thing we found is that it didn't really work all that well, people just used whatever code worked that they could find... easily identifiable when groups we knew were using it alot had zero. so, hit/miss for us, but we did find our culprit.
“A long habit of not thinking a thing wrong, gives it a superficial appearance of being right, and raises at first a formidable outcry in defense of custom.”
― Thomas Paine, Common Sense